Yep - I tend to agree with Arpt131, Lots of competition for the market. I'm not a great lover of the Columbia extension being used myself. But it's no different than .TV (Tuvalu) and a few others.
I could imagine a flight sales agency running with this quite happily.
B- $500-$999 until FlightDeals.com becomes developed.
After that.... depending on how successful FlightDeals.com is you will be able to set your asking price.
I think it's a tough sell when the .com is still available. Anyone with deep pockets to fund a real site like that will first buy the .com. It would be a huge feat to get the funding and set up a viable website on that domain.
If someone else does it you can ride the coat tails and probably get some good spending cash for the domain.
Its a nice name but i wouldn't bet much because is an .io . Although there is a trend for some cloud apps/services to use .io since .com is so competitive.
So i would say A