This letter informs an airline that the crew of a flight you were on was unprofessional.
1234, Main Street
Boston, MA 02123
01 April, 2005
<Recipient Address Goes Here>
<time of flight>, <people flying> <was/were> booked on flight <flight number> for <destination>, flying out of <airport name>. I thought I should let you know that during the flight, your flight crew behaved most unprofessionally and on some occasions were downright rude.
This kind of behavior is simply unacceptable from a professional airline. Please take steps to see that it does not happen again. If you wish to contact me about this matter, you can reach me at <phone number>. Thank you for your time.
encl: <List of enclosed items goes here>