The whole point of the case was if the Airline Deregulation Act overcame the contractual issue. Read the case, or, at least the syllabus.
The problem for the "unredeemed reward points" will have to do with the actual contract. If the store can change the terms at will and retroactively, the holder would not be in a line of creditors as the store simply changes the terms in BK. If they can't, then the holders of the contractual obligations will have some rights.
As in California, gift certificates cannot have an expiration date in general. (Certain items can have an expiration date.) If a store were to go BK, the holders of certificates would be in the line of creditors as a contractual right. If the certificate expired, no. However, even with the CA law, one exception would be if the certificate was "Distributed by the issuer to a consumer without charge under an awards, loyalty or promotional program". So, as you have already seen in your review, the state and the facts matter. State law will give guidance as to the nature and quality of the rights to the BK court.