100+ features, in one place

Month, week, and day calendar views where active reservations show in cyan, backups in orange, maintenance in red, and the viewer's own reservations in green.

Every create and edit re-checks the requested window against existing reservations and maintenance on the server. An overlap does not silently succeed: the booking is accepted as a backup instead of as an active reservation. The calendar itself live-refreshes for everyone when reservations change.

Filter the calendar down to a single tail.

Book a slot that's already taken; the reservation is marked as a backup and shown in orange.

When the conflict clears (a cancellation, an early return, maintenance lifted), the backup is promoted to active automatically, checked once a day and again whenever a booking changes. The member is told the moment it happens, in the app, by email with a calendar invite, and by text.

An instructor dropdown on the create/edit reservation form, with a graduation-cap badge on calendar tiles. The assigned CFI is notified on create, update, and cancel, in the app, by email with a calendar invite, and by text, worded for the instructor rather than the pilot.

The Finish Flight button on the current-flight card closes the reservation at the next quarter hour, releases the aircraft for the rest of the booking, and triggers backup promotion. Available up to an hour past the scheduled end.

When a pilot finishes more than an hour early, only the next pilot scheduled on that aircraft within the next 24 hours is notified, not the whole club, and not if that pilot has muted early-return alerts for the tail.

Optional per-organization limits on maximum reservations per member, maximum hours per member, and maximum reservation length, set on the Setup → Rules tab. Booking admins are exempt.

Permissions restrict which members can book which tails, settable at invitation time too.

A reservation whose end time passes without the flight being finished in the app is flagged on the calendar and counted in the Unfinished / Overdue Flights report. The flag is cleared if the member finishes the flight later.

A cancellation reason is captured and delivered in the cancellation notice.

A 'promote this flight to fellow members' checkbox; shared flights appear in a dashboard card with pilot, aircraft, time, and destination.

One daily run sends email and SMS reminders for every active reservation starting in the next 24 hours. Backups are not reminded.

A scheduled follow-up notification when a flight passes its end time unfinished, with a direct dashboard link.

The in-progress flight appears on both the dashboard and Flight Logs with a Finish Flight button, and stays there for 1.5 hours past the scheduled end. Finishing records hobbs and tach start and end, fuel added, oil added, and comments, plus a cost summary when billing is on.

A camera or photo picker for off-field fuel in the finish-flight dialog, and on manual billing entries too. The upload is handled by Centerline's own server rather than the browser, and a receipt can only be opened afterwards through a link that expires, never a public one. Receipts are linked from the admin billing view.

Missing entries between recorded flights surface as explicit gap rows showing the missing hobbs and tach range and the calculated time. The plus button on a gap row pre-fills the date, time, and meter values into a new entry.

Every row is checked against the one before it (zero end-tach, tach above hobbs, a start below the previous end), and the correct value is back-computed from that aircraft's own typical tach/hobbs ratio, the median across every clean flight it has logged, with at least three samples required, then offered as a one-click fix. When one upstream typo produces a wall of downstream warnings, the cascade is traced back to the row that is actually broken. Deterministic math, not AI.

One aircraft's full flight history with automatic hour calculation and running totals, filterable down to a single pilot. (Pilot activity across the whole fleet is the Member Activity report, not this screen.)

Flights marked as maintenance are excluded from billing; a flagged flight never generates a charge, however it is finished.

Once a billing entry exists for a log, members cannot edit, delete, or re-finish it; every path is checked on the server, not in the browser.

One aircraft's logs export to CSV with the correct columns for that aircraft's configuration: a tach-only tail exports no Hobbs columns.

Multiple photo attachments per squawk, each with filename, size, and type recorded.

The reporter can flag a squawk as recommending grounding.

Closing a squawk requires recording what was done; the resolution appears in the close notification email and permanently on the squawk detail.

A blue badge for informational, watch-this items, separate from open/closed status. The Squawk Cycle Time report and the open-squawk count behind the executive summary leave monitoring squawks out of their open counts and days-to-close; elsewhere (the Fleet Status card, the flight cards, the Squawks page), they still count as open.

Additional crew commentary can be added to a squawk.

In-app, email, and SMS notifications on open and close, with per-aircraft muting.

Admin-only calendar blocks, shown in red, with a description and comments; they block availability.

One-off maintenance items due on a specific date, such as an annual, transponder, ELT, or pitot-static check.

Recurring items scheduled by calendar months or by tach hours, such as a 100-hour inspection, oil changes, or TBO, each showing a visual progress bar toward its due point.

A dashboard card showing per-aircraft status, open squawks, and grounding warnings; warnings also appear on the current flight card.

Rates are dated, so historical and future rate changes coexist; one rate per aircraft per effective date.

Each aircraft is configured as WET (fuel included) or DRY.

Choose which meter drives the charge, per aircraft.

Wet aircraft support GALLONS (a per-gallon rate) or ACTUAL (receipt-based) reimbursement.

A completed flight generates one billing entry from the effective rate and the difference between the start and end meter readings, with a description auto-formatted like 'N12345 - 2.30 hrs HOBBS @ $145.00/hr'; enforced one entry per flight.

Every entry carries a category (Flight Time, Dues, or General), auto-assigned for flight and dues entries, with manual entries defaulting to General and an admin override available.

Each entry carries a debit and/or credit tied to a member, and optionally to an aircraft, rate, and flight log.

Filter by aircraft, member, category, and date range, with a totals row.

Billing entries export as CSV in QuickBooks Online invoice format, mapping category to product (Aircraft Rental / Dues / Other).

Members see their own entries, paginated and read-only, on their profile.

Clubs connect their own Stripe account; direct charges route through it.

When a member completes checkout, Stripe reports it back and a billing credit is posted against that payment, flagged with an 'Online' badge. A repeated report never posts the credit twice.

Surcharge ACH and/or card payments to recover processing cost: make-me-whole math for cards, which lands exactly, and a capped percentage for ACH, which is close but not exact. The ledger credit is always the original net amount, with the surcharge existing only in the Stripe session.

Admin-authored rich text (Zelle, Venmo, check) shown on every member's Charges tab.

An org-wide flat fee; an admin runs dues billing manually, picks a transaction date, and checks off members rather than having it charge automatically.

Warn by days-overdue and/or dollar threshold, with partial payments applied to the oldest charges first; the alert appears on the member's own dashboard, linking to their charges.

An AI-authored written briefing over the trailing three months covering fleet activity, membership, maintenance with per-aircraft commentary, and finances. The figures are calculated exactly rather than written by the model, which supplies only the narrative around them. Stored once generated and regenerable after data corrections.

Hours flown, flight counts, downtime, and realized dollars per hour for each aircraft over the period.

A heatmap of reservation starts by day of week and hour, filterable by aircraft.

Average days between booking and flight, per aircraft.

Reservations, completed flights, and hours flown per member.

Reservations whose end time passed without the flight being finished in the app, per member.

Maintenance days and maintenance events per aircraft over the period.

Squawks opened, squawks closed, and average days to close per aircraft. Monitoring squawks are excluded.

Medical, flight review, and club review currency for every member, with the club's grace days applied, exportable to CSV.

Charges minus fuel credits earned per aircraft over the period.

Fly-ins, safety nights, pancake breakfasts, ground school, and member meetings, with a title, description, location, start/end time, and an all-day option.

Attach a photo to an event; it's stored with a permanent public URL usable in-app, in emails, and on other sites.

Members register for an event with an optional comment.

An optional seat cap, unlimited when left blank.

Broadcast a notification to all members or to registrants only, with optional comments.

The daily job sends a reminder to everyone registered for an event happening the following day. Members who have not RSVP'd are not reminded.

One private calendar feed per organization, covering upcoming events plus the last 90 days, subscribable from Apple Calendar, Google Calendar, or Outlook. All members share the same link, and regenerating it means everyone resubscribes.

A dashboard card surfacing what's next.

Signing up starts a 60-day trial and collects a payment method only if one is required.

The subscription is billed by fleet size, not headcount: the quantity is the club's active aircraft count, set at signup and reconciled nightly. No seat caps, no tiers.

One user account joins many organizations, with an in-app switcher, and the club you are currently working in is remembered securely between visits.

Roles attach to a membership rather than to a person, so the same pilot holds different roles in different clubs.

Account Owner, Booking, Maintenance, User Management, and Member, with multiple roles allowed per member.

Invitations sent as a private link, with roles and aircraft permissions already assigned; unaccepted invitations are expired automatically by a daily check.

Face ID, Touch ID, and Windows Hello sign-in with no username to type, registered in Profile → Security with support for multiple devices per member; passwords still work as a fallback. Each sign-in attempt is only valid for five minutes.

Full profiles with contact info, emergency contact, about-me, and a profile picture.

Private notes on a member, kept separately for each club, visible only to Account Owners and User Managers, never to the member.

Suspend access with an optional message; checked on the server, not in the browser, and shown as a lock icon in the user list. Locked members reach a dedicated page and can still switch organizations, and every lock/unlock is audit-logged.

An expiration date tracked per member.

An expiration date tracked per member.

A club-specific recurrent review date tracked per member.

Independent grace days for medical, BFR, and club review, set on the Setup → Rules tab. They apply both to the booking block and to the Expirations report.

A daily job emails and texts members four weeks before a medical, flight review, or club review expires, respecting each member's delivery preferences. The reminder window is fixed at four weeks and is separate from the club's grace days, which apply to booking enforcement and the Expirations report.

Certificate number, certificate date, AOPA number, and club member number tracked per member.

An instructor rating plus a CFI services description.

Covers reservation created, updated, cancelled, and reminded; flight overdue; backup promoted; certificate reminder; squawk created and closed; event registration confirmed, event reminder, and event notification; announcements; and system notices. An early return is delivered as a reservation update.

In-app notification center, email, and SMS.

Reservation created, updated, and deleted emails carry an .ics attachment, as does the backup-promoted email. Reminders and cancellation notices are plain email.

Independent email and SMS toggles per member.

A toggle grid of aircraft by notification type mutes the three fleet-wide alert kinds (club-wide cancellations, squawks opened and closed, and early returns) per tail. Everything is on by default, and alerts about your own reservations are never muted.

Any member can send a rich-text notification from the notification bell to one member or the whole club; the formatting is limited to a safe set on the way in. Marking it as requiring acknowledgment puts it in front of the recipient as a modal they must clear before continuing, and blocks deletion until they do.

Import users (contact details, certificates, and currency dates), reservations (including historical), squawks, and maintenance schedules, with flexible date handling and everything checked for errors before anything is saved. Imported members arrive with the Member role; officer roles are assigned afterwards in Centerline.

Export the same four kinds of record for your own organization, with linked records shown by name rather than by ID, and nothing left out.

Each of the nine data reports exports its current filtered rows to CSV. The Monthly Executive Summary is a written briefing and has no CSV export.

Name, description, website, phone, email, full address, and timezone.

Time Tracking, Events, and Billing each disappear completely from the app when off, with no data loss on re-enable.

An ordered directory of officers by role: president, treasurer, safety officer, maintenance officer.

Non-member contacts (mechanics, avionics shops, FBOs, insurers) with company, phone, email, website, and description, reusable across the organization and per aircraft.

Attach members or external contacts to a specific tail with a role; surfaced on the dashboard's aircraft contacts card, and on maintenance blocks for contacts who also hold the Maintenance role.

Tail number, type, model year, engine, track-hobbs toggle, current tach, average daily usage, sort order, and decommissioning.

Generate or replace the organization's iCal feed link.

Plan status, trial countdown, and billing portal access.

Cards composed from next flight, current flight, upcoming flights, fleet status, maintenance status, social flights, upcoming events, club instructors, org contacts, aircraft contacts, past-due alert, getting started, and welcome aboard.

Each member picks the screen the app opens to. Dashboard, Reservations, and Maintenance are always offered; Logs and Events appear when those features are on; Billing is offered to Account Owners when billing is on.

A dedicated mobile navigation bar.

A full dark theme covering the whole app. Signed-in members pick light, dark, or follow-my-device from the user menu, and the choice applies everywhere, marketing pages included. New and signed-out visitors see the light theme.

Every surface is built mobile-first.

12 categories: Getting Started, Reservations, Flight Logs, Squawks, Maintenance, User Management, Organization Setup, Billing, Events, Reports, Your Profile, Troubleshooting. The same articles are browsable publicly and in-app.

Search across every article, with matches in the title ranked above matches in the body.

Published release announcements with summaries, shown in-app and at a permanent public URL on the marketing site. Role targeting selects who is notified when one is published; the announcement page itself is readable by anyone with the link.