Sorry i dont have any technical information its just what everyone seems to say about jet 2,that their aeroplanes are very old and they break down a lot, ive only flown with them once and we were unlucky enough to break down which caused a long delay, monarch however seem to be very reliable and their planes seem to be very new, however if ive got my facts wrong forgive me, finally i must say the jet 2 staff were wonderfull