Yeah, I've worried about the same thing. I don't think its true, I saw an AS MD-80 at BUR the other day. Also I'm going Portland in a few weeks and its supposed to be a MD-80 flight. AS moves schedules around constantly. Recently it was 4 (of 6) flights a day form BUR being operated with MD-80s. JabPilot is right, now the 2 MD-80 flights are the 6.55am to PDX and the 2.18pm to PDX. I agree and I think we've talked before about how boring BUR is becoming. AA and AS MD-80s keep it interesting along with HP Airbusses and FedEx Airbusses plus UPS 757s.
I think the MD-80 is a great plane...much much better than those ratty 734s AS forces on us! I've heard AS will phase MD-80s out around 2005 - hopefully then I won't be living in LA and flying the airline airline anymore! By then they'll be a low-fare all-737-carrier....how creative of them!
Anyway have a good time seeing AS MD-80s at BUR for a while to come...