I dont know about the other airlines you stated flyer but virgin crew are not supplied suitcases, They have to buy Their own and they have to be black or red (not many opt for the red!) They sell delsey and samsonite at the training centre for about 50 - 80 quid depending on size etc. If one breaks they are replaced by virgin but at the airport and usually only the small, or if your lucky they may give you a big samsonite.