Ryanair
Just to put TheAmbler, Shoey, Flt Lt W Mitty and everyone else's minds at ease regarding Ryanair, out of the way airports and no engineering cover........we don't have the option of carrying defects.
On shutdown the aircraft automatically "phones home" - we can't stop it - and downloads all the maintenance and FDM data.
Last time I had a defect away from base Maintrol had arranged for a 737 engineer from another company - the guy was waiting on the airbridge for the pax to get off - before I had the opportunity to call them and let them know the aircraft was tech. Ops had grounded the jet by the time I called asking for a flight plan delay.