The C-40 is an executive airlift platform used for the transportation of U.S. leaders around the world. The C-40 is a modified version of the civilian Boeing 737-700, equipped with enhanced avionics and managed passenger communications. The C-40s primary customers include combatant commanders, members of the Cabinet, and Congress. At Joint Base Andrews, the 1st Airlift Squadron under the 89th Airlift Wing operates the C-40 in support of executive airlift missions.