Im with BB! I used to be somewhat fearful of flying, because I always though the plane was hanging in the air JUST BARELY. That is, until I flew myself. Its friggin easier and takes less actual effort than driving does! And youd be downright amazed at how stable and unstressed an aircraft in flight is, even at slow speeds.  
  
Id venture to say that at cruise, an aircraft is more stable and under less actual physical stress than either a car on pavement or a boat on water. 
  
That should cover the actual flight. The rest of the experience, well...airline travel now ranks up there with bus travel in terms of convenience and comfort.