I just loved the Dc9-15 series - it really sounded like a jet when it screamed into the air, it pointed nose down to the ground on finals, had an aisle so wide you could turn a cart round in it, and seats like armchairs. The seatbelt/no smoking signs were engravings onto a metal plate on the bulkhead - an orange light came on to light them up. Finally, it poured condensation over the two c/s at the back constantly - pure class. Makes the B737NG seem utterly boring now!