President Barack Obama and his entourage were switching to a different plane for his return trip to Washington on Sunday because of a minor flap issue with the aircraft, dubbed Air Force One, that flew them earlier in the day, a spokesman said. 'While in Philadelphia, we have transferred to a backup airplane due to a minor mechanical problem with one of the aircraft's flaps,' White House spokesman Eric Schultz said. 'This switch to a backup C-32 will not affect our schedule.' Any plane that carries the president maintains the name Air Force One. Obama traveled to Connecticut earlier on Sunday for a campaign rally before flying to Pennsylvania for another campaign event ahead of Tuesday's midterm elections.