An american airlines plane has been forced to land urn strander strange circumstances. A whole row of seats shaken loose. Passengers upended. And this is the second time seats have come loose and... See More
An american airlines plane has been forced to land urn strander strange circumstances. A whole row of seats shaken loose. Passengers upended. And this is the second time seats have come loose and forced a landing in three days. So, what is going on? For the latest on what happened today, let's go right to abc's senior national correspondent, jim avila. 685, what can I do for you? Roger. Got an unusual one for you. Reporter: No one can remember this happening before. Not passengers, so rattled they didn't want to be identified. The seats flipped backwards and so people were essentially on the laps of the passengers behind them with their legs up in the air. Reporter: Not aviation experts. I've never seen anything like that in all my years, 30 years of covering the airline industry. Reporter: No one can remember airline seats disconnecting from the cabin floor. And now it's happened twice in three days aboard two american AIRLINES 757s. During climb out, rows, passenger seats row 12, d, e and f came loose out of the floor. Reporter: American airlines flight 685, from boston to miami, diverted in mid-flight, declaring an emergency and landing at jfk in new york because a row of seats had disengaged from its rails on a nearly full flight. One of the displaced passengers is moved to the flight attendant's jump seat. But fearing turbulence en route, the captain decides to land before the loose row becomes an in-flight missile. We don't want that thing flying around and hurting the passenger behind it. The seat is loose and can rotate pretty quickly. Reporter: Today, a second american flight from jfk to miami turned back after takeoff because of loose seats. Elevating american's struggles from inconvenience to safety concerns. I think it could be sabotage or it could just be sloppiness. But either way, it's kind of a disaster for the airline. Reporter: American is in the middle of a labor dispute with all of its unions including maintenance workers and despite increase in maintenance delays the airline were deliberate, today, american claims this is different. And anyone who says that the disconnected seats are always a deliberate act are irresponsible and outrageous. The unions have denied any work action. The faa says it is monitoring the seat situation and inspections on the two american planes actually found more than just one row in each were loose. Tonight, american has ordered its 757 inspected, saying there could be a possible issue with a certain model of seat and how they fit into the tracking. They say the seats in question were not all installed at the same location.
This transcript has been automatically generated and may not be 100% accurate.