New format for Radio Callsigns started today.

Today, with the start of the Winter schedules, Ryanair's callsign format has changed. Before, most callsigns had "Ryanair.... then 1 or 2 digits, followed by 1 or 2 letters.... e.g: RYR74DF, or RYR9PK....whereas now, all callsigns are now 3 digit, 1 letter, e.g: RYR935U etc.

There are some callsigns which are the same as the actual flight numbers though.