US Version Question (perhaps World Wide)

At the end of every episode of South Park (US Version, may be included in other countries versions, would love to find out) is an old stock footage comercial for Braniff Airlines. Now no matter how many times Braniff has changed ownership in Dallas as a tax right off, it is still a dead company/airline for the most part since the second Chapter 11/13 in the late 80's/early 90's. Could someone please tell me if they know why that is on the end of every episode? It pisses off a lot of former employees of the company and its divisons that were jacked around by Braniff during the second colapse and beyond, we would like either get a reason or have them change it to a real sponser's ad (like the australia version with kellogs i have been told). Otherwise the shows great and hope it sticks around for a long while. Please again post a reason for that ad at the end if you know why. Thanx.