DOS Airline
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Everybody pushes the airplane until it glides, then they jump on and
let the plane coast until it hits the ground again, then push again,
jump on again, and so on.  For relaxation Bill's autobiographies are
tucked in the back of every seat.

MAC Airways
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All the flight attendants, captains, baggage handlers, and ticket 
agents look the same, act the same.  Every time you ask questions 
about details, you are told you don't need to know, don't want to 
know, and everything will be done for you without you having to 
know, so just shut up.  Cute little signs are everywhere and 
outside every window there are flying toasters.

Windows Airline
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The airport terminal is nice and colorful with friendly flight
attendants, easy access to the plane, an uneventful takeoff...then 
the plane blows up without any warning whatsoever.  In mid-air you
are informed that the rest of your flight will be continued on DOS

Unix Airline
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Everyone brings one piece of the plane with them when they come to 
the airport.  They all go out on the runway and put the plane 
together piece by piece, arguing constantly about what kind of 
plane they're building.  When another plane lands nearby the
passengers begin breaking up into meetings and trading pieces of 
the plane.

i got this from  http://gdl.msu.edu/%7Evanhoose/humor/0156.html - http://gdl.msu.edu/~vanhoose/humor/0156.html