United MileagePlus (Consolidated) - Old Continental 10% off coupons - Still Valid?

I was cleaning out some old papers, and found a couple 10% off coupons from Continental--I got them for some old mechanical delays. Any idea if new CO/United will still honor them? I'd love to get 10% off some international flights with them.

Any expiry dates on them? Else you can always try to get them to honor it.

I have some domestic 10% off coupons that expired many years ago which still work on Continental website.