The chaotic opening of Heathrow Airport's Terminal 5 showed "serious failings" by British Airways and airport operator BAA, MPs have said.
The event in March was a source of "national embarrassment", the House of Commons Transport Committee said.
It said the problems, which included cancelled flights and thousands of bags going missing, "could and should" have been avoided with better planning, BBC reports.
The companies have apologised and said the situation had improved since then.