Two Aerolíneas pilots built a $4.99 app for colleagues: no ads, outsiders can't sign up, 7 weeks to 75 five-star ratings

Copailot is a Spanish-language app built by two active Aerolíneas Argentinas pilots, for that airline's pilots only. It automatically pulls your roster, calculates flight-time limits, checks your payslip allowances, and helps you fill your flight hours into the civil aviation authority's electronic logbook. It went live in Sep 15, with no ads and no press coverage anywhere online. Outsiders can't even create an account. In 7 weeks it has 75 ratings, all 5 stars, and it reached #65 on the Utilities Top Grossing chart in the Argentina store. Below: why it worked, where its ceiling is, and whether you can use the same approach.

Oct 26: an update only pilots can read

On Oct 26, Copailot shipped version 1.0.6. The release notes list three changes: a new "Rest" page showing your flight and duty limits and weekly rest, with "if it doesn't add up, simulate which flight to drop"; flights added or changed after standby is activated are now counted; and for completed flights you can see who else was in your crew.

The next day, an Argentina store review read: "Muy completa y están actualizando constantemente con mejoras", meaning it is very complete and they keep improving it.

Someone who can write "does a flight added after standby activation count?" is clearly a pilot. This was the 7 release in 6 weeks. The developer account is PATRICIO RUSTAN, and the terms say it is run jointly by Patricio Rustan and Guido Augusto Santos. Per their LinkedIn profiles, Rustan is a commercial pilot at Aerolíneas and an industrial engineer; Santos is a first officer on the Boeing 737 NG/MAX.

What it actually does

In one sentence: it collects a line pilot's monthly administrative chores into a single app. The store page covers five areas:

• Rostering: enter your login for the airline's Crew Web Portal, and the app pulls in what you're scheduled for and what you've flown, places it on your calendar, and can sync to Apple or Google Calendar.
• Limits: it calculates in real time how far you are from flight and duty limits under the regulations, plus a "¿Hasta cuándo puedo volar?" (how long can I keep flying?) calculator, which is "useful for making decisions while you're in the aircraft."
• Payslip items: under the union agreement it works out which allowances you should have this month (standby, night flying, overtime, swaps, per diems), so you can "check your payslip with evidence."
• Flight logbook: the electronic log is always up to date, guides you in entering hours into ANAC's CAD system, and prepares your monthly filing (DDJJ). Older logs can be imported from the PDFs your company provides.
• Swap marketplace: you post a day you want to give away, the app first checks overlaps and limits for other pilots, then shows it to matching colleagues; only when someone taps "contact" do they get your WhatsApp.

It works offline in airplane mode, and portal credentials are encrypted on the server. Pricing: free for the first month, then $4.99 a month, 24.99 for six months, or 39.99 a year (per the website terms, 2026-09-03 version).

Why now: the rules changed three times in one year

Argentine pilots have been pushed around by three things this year:

1. Paper logs are gone. From 2026-01-02, ANAC only recognizes flight hours recorded electronically in the CAD (Casillero Aeronáutico Digital). Every pilot now has to enter data into a government website each month, which didn't exist before.
2. Flight-time rules keep changing. Decree No. 378/2025 relaxed maximum flight and duty times and shortened rest periods, and ANAC Resolution No. 812/2025 set out the details. In 2026 May, a labor appeals court suspended the decree (Infobae, 2026-05-11). With rules changing back and forth, "can I take one more flight this month?" became a genuinely hard question to answer.
3. Pay is tied to how much you fly. In 2025 December and 2026 April, Aerolíneas and the union signed successive pay agreements with incentives for flying more (Página12, Infobae 2026-04-08). Allowances are direct cash, so people want to check them line by line.

The company portal handles rosters, the ANAC site takes logbook entries, and the agreement text defines allowances. Three sources, none of which talk to each other, and no system combines them for you. Copailot is the layer in between.

Where users come from: colleagues telling colleagues

There is nothing in public channels: a web search for "Copailot" returns Microsoft Copilot and several European companies with similar names; nothing mentioning it has appeared on X in 60 days; an Argentine aviation outlet in October covered a different local app, "Copilot EFB". Store search doesn't help either, since the name collides with Copilot, and the website can only say "search for Copailot in the store." That line is written for people who already know the name.

But the ratings have grown at a steady pace: 11-04 60, 11-05 65, 11-06 71, and by late that day the Apple feed showed 75. That is 5 and 6 a day, with no sudden jump.

The only thing that explains this curve is word of mouth within the crews (inference; no group chat screenshots obtained): the founders fly for the same company; registration requires a document number, which the server checks against the pilot roster in Annex II of the union agreement, with one account per document and anyone not on the list locked out. The swap marketplace gives users a reason to pull in colleagues: the more people in the marketplace, the more likely your day gets swapped.

How much it's made: estimated, not much

Reaching #65 sounds good, but that chart has a low bar: in the same Argentina Utilities Top Grossing chart, Pilotfy sits at #51 (11-06) with only 141 ratings and no growth in the last 7 days. So #65 probably means a few subscriptions a day (estimated).

The penetration rate is more telling. RosterBuster, the world's largest crew rostering app, has spent 11 years in the Argentina store and has 304 ratings; Copailot has 75 in 7 weeks. No official figure for how many Aerolíneas pilots there are was found; a report 2011 years ago put the number at 1,100, and the company later said it would hire 320 more over 2025-26 years, so roughly 1,200 to 1,500 pilots (estimated). At an iOS rating rate of 2% to 5%, downloads may already be in the hundreds to low thousands, a sizable share of the company's pilots (inference).

That's the ceiling: even if all 1,500 pilots pay annually, that's roughly $60k a year. It's a respectable side business run by two people after work, and it won't get much bigger.

Who it's competing with

Global airline-crew apps can already pull Aerolíneas schedules, but they stop at schedules and logbooks. Local Argentine aviation apps are all doing general aviation. For Aerolíneas pilots' admin work, there's no direct rival and no copycats in sight. The reason is simple: this niche is too small for big players, and the rules are only understood by insiders.

Its weak spots

• Everything runs on employees' own logins to scrape the company portal. If the airline changes its system or decides to block scraping, the core feature stops the same day. Clause 4 of their own terms says so: the service "may be interrupted without notice" if the other side changes.
• One company is the entire market. To grow, you'd have to redo the work for every airline and every union agreement.
• Who's liable for mistakes? The terms repeatedly say "official figures prevail" and "not responsible for decisions made from calculation errors". A miscalculated time limit is not a small thing.

If it were you

C: The playbook is worth studying, but copying Copailot for Aerolíneas pilots has no room left, and doing it in another industry is hard too. Its key asset is that the founder is inside the crew community. You can't get that, and a single company caps revenue at maybe a few tens of thousands of dollars a year.

Who it fits: people who work in a heavily regulated job with union agreements and complex rosters: pilots, flight attendants, rail and metro drivers, hospital nurses and doctors on shifts, air traffic controllers. You also need to code, or have a coder nearby. If you're sick of the spreadsheets every month, that's your proof of demand.

Who it doesn't fit: outsiders. Without portal access you can't test, you can't read the agreement clauses, you can't get into crew group chats, and users won't hand their company login to a stranger. It also doesn't suit anyone aiming for a big business: the ceiling is the company's headcount.

How to build it: start by listing what you check by hand every month: which system holds the rosters, how the regulatory limits are calculated, which payslip items get missed most, which official web page needs a monthly filing. Pull the portal data with your own login, hardcode the regulatory and agreement logic, and use it yourself for a month. Then add a feature that only matters between colleagues (shift swaps, finding free days), so every new user makes it more valuable for the existing ones. Copy Copailot's approach: verify users against the staff list, state clearly in the terms that it's "unaffiliated with the company, official figures prevail", price at about the cost of a meal, and offer the first month free. Expansion means similar groups in the same country (in Argentina, pilots at Flybondi or JetSMART, or Aerolíneas flight attendants), and each one needs its own agreement adaptation.

How to get users: no paid spend. Post in crew chats, department groups and union groups. Your first users are people you know; swap features will get them to recruit their colleagues. Don't count on store search: an app like this is only searched for by insiders who already know the name.

When to move: the window follows the rules. The months when an official system goes live, a regulation changes sharply, or a new agreement is signed are when people most need help with the math. Argentina's current round is already half over. In your own industry, wait for the next "starting from this date, you must..." rule.

Signs you've misread it: ① If Copailot's ratings plateau at one or two hundred after a year, or the airline blocks the portal, the approach doesn't hold up, or the window was just that regulatory change. ② If instead it expands to flight attendants or other airlines and ratings keep climbing steadily, then "one company × one profession" can be replicated sideways, and the grade should go up.