Anyone who has watched the last decade unfold and still believes in A plans is a fool. This is not just in the airlines, but in other industries as well-Ford and GM may ring a bell. Your choice is to accept an unsecured promise to pay in the future or money in your account now, this shouldn't even be a question for anyone here.
If the EB and UPS can try to negotiate A plan payments up, isn't it also likely they may try to negotiate them down at some point in the future?