717/727s
Although I actually get ringing in my ears when I spend alot of time on the tarmac I love the sound of the 727s! they have older jet engines which totally scream! :-) On the other hand the 717s are so awesome because they are sooo quiet! From a catering point of view....they are also FAB to work on! really quick and easy to clean and coz they use fresh air..they dont smell so much.