Originally Posted by
EmailKid
Yes, without an expiration date they are valid

Originally Posted by
hughw
we used several old continental ones without and expiration date EWR-CDG without FA batting an eyelash,
Never had a problem using those. It's the ones with expiration dates that have been turned down, or the FA said "I'll take it this time as a courtesy, but those are invalid."
That's why I always use one of the ones with expiration date first, and offer one without if I have to