FWIW:

$88 & up -- Washington DC Weekend Sale, R/T from 15+ Cities

AA is offering great weekend fares to Washington D.C. from cities all over the U.S., starting at just $88 roundtrip!

Sample roundtrip fares include:

Raleigh/Durham to Washington D.C.... $88
Dayton to Washington D.C.... $126
Chicago to Washington D.C.... $138
Louisville to Washington D.C.... $142
Boston to Washington D.C.... $178

http://dir.travelzoo.com/Air.asp?int...ry=11&id=77113

http://www.flyertalk.com/forum/Forum71/HTML/010065.html

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$88. rt sounds pretty darn good from RDU, no?