HE very likely landed at Andrews Air Force Base in MAryland- it is just 11 miles from the white house. It is the 'HQ' for the gov. transports- the 2 identical Air Force One aircraft are based there as are the fleet of 757s used to transport the Sec. of State and the Sec. of Defense and the Vice PResident.
From Andrews, the president is flown one either a blackhawk or a sea-king variation (when I was in DC- I saw both in the air in the US president livery)
good info on the hilo here
http://home.rose.net/~dingdong/Aircraft/The secret service uses a C-17 and a C-141 to transport thier personell as well as the president's helicopter and motorcade.