If I understand the jist of your question you are looking for a hotel near DCA that gives discount to crewmembers? My understanding is that none of the hotels the crews overnight will give the singular pilot a discount on a room.
Unfortunately, you're left with only one hotel: THE AMERICANNA. It's a 1950's time-warp....picture a two story 50's style motel snuggled-in amongst highrises. It's basic...no clock radio, limited cable TV, one or two towels at most, spartan decor. Good news, it's clean, close to the airport, within walking distance to metro, many resturants. They give a hefty aircrew discount (many people swear by it), the cost: FIFTY BUCKS. Their number is on the hotel switchboard in baggage claim. Good luck.
the turtle