Reagan National Airport is reached directly via the Metrorail station adjacent to Terminal B/C. Servicing an estimated 20 million passengers annually, Reagan National is the closest airport to the D.C.
BLUE OR GREY The called Blue or Grey Border Collie is due to the presence of a dilute gene, so the deepness of black color is blended, to bluish, slate or dark grey. As well as it happens with other coat colors, the differences are easily seen on puppies (better than on adults, whose coats gets darker).
Its worth noting that dilution alopecia is very rare in all breeds and especially so in border collies. I have bred and met hundreds of blue and lilac border collies and have only ever seen one affected with this condition, while visiting a dog show out on the continent.