Back to Burbank.....
Bonanza Air Lines - It appears Bonanza never served BUR. I'll check once again.
Pacific Air Lines - Correct! Pacific flew B727-100 service nonstop to LAS and SFO.....and they may have been the first air carrier to operate jet service into BUR, although I'm not quite sure about this.
Frontier Airlines (both the old and the new) - I do not think either the original or the reincarnated carrier ever served BUR but I'll check on this as well.
Southwest Airlines - still going strong at BUR.
Alaska Airlines - also still in operation at BUR.
Northwest Airlines - I do not think they ever served Burbank as Republic was well down the path of dismantling the old Hughes Airwest route system back when NW acquired RC. But I'll check.
Happy Thanksgiving, Everyone!