When Ernest Tilley's (Richard Attenborough) daughter is killed in a hit-and-run, he vows he'll do what it takes to avenge her death. Armed with a homemade bomb he tracks down the killer to an airport and boards the same flight. Once in the air, he threatens to blow up the plane. As they desperately try to find the bomb the dramatic story of each of the other passengers unfolds. Emotions run high as they confront the reality of their situation. A husband confesses to cheating on his wife. Romance blossoms between two flight attendants. A divorced couple realise that they're still very much in love and a widow admits that she never loved her wealthy husband. Up in the air their fate now lies in their own hands. Can Ernest, a man who has lost everything, be stopped in time?