US low-fare carrier Spirit Airlines and the FAA are investigating an incident in which the crew of one of its MD-80s may have nearly stalled the aircraft twice by flying too high for the MD-80's weight, reports the Washington Post.

The newspaper also reports that the pilots of the MD-80 failed to report the incident upon landing, so that the aircraft carried out two more revenue flights without undergoing mandatory inspections to determine whether engines and airframe had suffered over-stressing in the incident.

Source: Flight Daily News