When I'm at the airport I usually try to use my last bit of local cash at duty-free. I can always use some chocolate and I've yet to find a shop that won't take my coins and the balance on a credit card.
The one time I had some significant cash (Singapore VAT-back program) I used a normal Travelex to get paper, then the coins I followed my above method.
(Edit to avoid duplicate post -- new below)
Originally Posted by
StuckInYYZ
Cathay used to promote a change for good program on their planes.... Haven't seen it in a while but I haven't rode them in ages.., The FA's would provide you with a small paper envelope and you would dump your old coins there and they would forward it.
Last year (I dunno if it's ongoing), AA offered a similar program where they collected any currency including coins and donated it.