The B-2 Spirit, pictured here flying next to a B-52 Stratofortress, is a more modern and stealthier aircraft than its predecessor. However, high running costs and the fact only 20 were built mean ...

US Air Force B-52 planes conduct aerial refueling which helps keep the planes airborne longer and saves time landing and refueling. Following is a transcript of the video. US Air Force B-52 planes ...