I'm based at IAD, but not employed by either of the regional airlines you listed. However, I was borned and raised in the DC Metro area and live near IAD. Is the cost of living higher than other areas in the U.S.? Yes. Can you make it on first year regional pay? I did it at two different regionals, so, yes. I get the feeling people from other areas are more sensitive to the higher cost of living here, as they have a basis for comparison. PM me if you have questions about specific areas.