I just read my biztravel.com bulletin which says:
If you are an Elite or equivalent member with any airline - except
Northwest or America West - Continental can (with your last frequent
flyer statement) "instantly" match your level in OnePass where,
of course, the privileges are reciprocal. Keep this in mind if you
are thinking of using The Biztravel Guarantee but are hesitant to
travel on Continental because of earned miles on a different carrier.