If operating systems ran airlines:
  
DOS Airline:  Everybody pushes the airplane until it glides, then
jump on and let the plane coast until it hits the ground again,
then push again, jump on again and so on.
  
DOS with QEMM Airline:  The same thing but with more leg room to
push.
  
Mac Airline:  All the stewards, stewardesses, captains, baggage
handlers, and ticket agents look the same, act the same, and talk
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.
  
OS/2 Airline:  To board the plane, you have your ticket stamped
ten different times by standing in ten different lines.  Then you
fill out a form showing where you want to sit and whether it
should look and feel like an ocean liner, a passenger train, or a
bus.  If you succeed in getting on board the plane and the plane
succeeds in getting off the ground, you have a wonderful
trip...except for the times when the rudder and flaps get frozen
in position, in which case you have time to say your prayers and
get yourself prepared before the crash.
  
Windows Airline:  The airport terminal is nice and colorful, with
friendly stewards and stewardesses, easy access to the plane, an
uneventful takeoff...then the plane blows up without any warning
whatsoever.
  
NT Airline:  Everyone marches out on the runway, says the
password in unison, and forms the outline of an airplane.  Then
they all sit down and make a whooshing sound like they're flying.
  
Unix Airline:  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.