Let me enter my PIN number into the ATM machine before I read the SMS message

The following was received a while back for my online flight reservation.
I think someone at JetBlue needs to ask him/herself a few questions. Does "code" sound too secretive? Maybe they're just using base 26 or 36? (edit: to be fair, the probability of having all letters in base 36 like the above case is 14.2%)

Note: the above image has been modified in 1 (maybe A, if you're JetBlue) or more ways to protect my aged itinerary's privacy. The alterations do not effect the validity of this post.