My second-hand impression is that aircrew scheduling is a bit different from most jobs.

The flight attendants are not assigned a fixed schedule, but instead “bid” on specific trips: depending on their preferences, some crew might want flights of a particular length or on a certain type of plane, to arrange layovers in a specific city (or none at all), or even to work with/avoid certain colleagues.

They also alternate between periods where their bids set the schedule (“line”) and where they are on reserve/standby to fill in on flights where someone is missing. This could be because of illness, but flight delays and working hour restrictions (via safety regulations) add a lot of complexity. Another added wrinkle is that most crew don’t get paid until the flight doors are closed, so they really do not want to spend a lot of unnecessary time at the airport.

Thus, it’s a lot worse than managing schedules at a coffee shop, and I can totally imagine how a specialized app could help.

More: https://www.cabincrewchitchat.com/flight-attendant-bidding/