Not sure what would happen if they were to Phase out the Airbus fleet. I mean they have just got brand new aircraft over the last year or so. Plus I'm not sure if the 737MAX will be able to get in to smaller airports like Gibraltar (I know the 737-300 can)
I don't think Ryanair Jet 2 of Fly Dubai have ever operated airbus
Jet2 Have operated an airbus aircraft on lease from Titan but other that that they haven't