I was on a WN flight into DEN this evening which had to divert to COS for a bit to wait out some weather. Certainly something of a non-event, but it got me thinking:
Do airlines have pre-arranged contracts/agreements with common diversion airports? In this case, WN sent a handful of jets to an airport which it doesn't serve, but is a very close and logical alternate to a pretty significant station/hub. In other words, when WN started building up in DEN a few years back, did they call up the FBO at COS and make a formal agreement for service, knowing that from time-to-time some of their 737s would end up there needing fuel and other ground services? Or is it more of a case-by-case basis?
Obviously, had I been on UA or even AA, those airlines' COS ground staffs and contracts probably would have taken care of my flight. But in this case, WN has no employees at COS (I assume).
I know the combinations and situations to which something like this might apply are infinite. Just curious to hear from the pros as to what degree these situations are anticipated and planned for.