People need to be more 'Zen' about travelling by air - It makes life infinitely calmer.
The plane may fly on time - it may not.
You might get a good seat - you might not.
The service might be good - it might not.
Any delay may be handled properly - or it may not.
The plane may make it to its destination - or you may die enroute.
The problem stems from the fact that so many people have worked so hard to make travel by air, safe and dependable, and it is generally so good - that it is now an expectation that everything will go to schedule, and all the planets will align and make the aeroplane travelling experience 100% as planned.
The reality of life is that the only sure things are: death & taxes - most people should learn to live with that.