A valuable Boeing 747 is hijacked, but a mid-air accident causes the plane to crash land in the ocean near the Bermuda Triangle. A rescue operation to recover both the passengers and the priceless artwork on board is mounted but it's a race against the clock to get them all to safety before the submerged plane sinks completely under the water.
Easily the most watchable of the four films in the series; this one actually has an interesting scenario for a plot. As with keeping in line with the previous entires, this offers a big star cast who all look out of place - again.
See also Airport, Airport 1975, and The Concorde... Airport '79.