Maybe, but look at Braniff and Eastern (or did those miles survive)?
By the way, buck, if you're saying April 31st because you're thinking about the "expiring" ability to use the Equity Miles award charts, that has been extended to 30 Dec 99, and you can redeem the certificates for a year after you receive them, and then the tickets are good for up to a year after they are issued, so you still have some time. See below from a thread I posted to in December:
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I checked out the TWA Aviators site and it still reads (read?) 30 Apr 99 as the deadline for requesting awards, so I e-mailed them asking which was correct. They responded, "You are correct in that Equity awards may now be requested as late as 12-30-99. This also pushes the time limit for surrendering the certificate for a ticket up to 12-30-2000 etc."
So, as I read it, we now have until 12-30-99 to request an award, 12-30-2000 to turn it into a ticket, and, since tickets are good for one year, the travel may be done as late as 12-30-2001.
[This message has been edited by Counsellor (edited 02-26-99).]