good...and sorry ment to say about the MD's...the 11 is obvious but the others are more difficult...
probably a driver of one will give better guidance but as a passanger i would say the newer ones like the 88 aand 90 were much longer and thinner and had beautiful pencil thin ( when looking from underneath ) wings and quieter and longer sleeker engines..
again check the net for that.
the 11 of course has the 3rd engine up on the tail and is wide body...all the others were twin rere mounted fans..
there you go...
