Be very careful, when sending things back to TWA.

I sent back two certificates to be extended per their instructions. They were sent certified return receipt requested. They were in fact received and signed for. After two months with no reply I began asking what was happening with them.

I was told, "sorry, we cannot find them and although you have proof that we signed for a package that you sent we dont have proof that you actually put anything in the envelope. As far as we are concerned we owe you nothing. Lost certificates cannot be reissued, be more careful next time."

They refused to do anything. Needless to say I have not flown on TWA since.