Southwest Airlines Co., the largest Max operator, first learned about the problem with the disagree alert after October's Lion Air 737 Max crash.

Hundreds of flights were delayed Monday after a data disruption temporarily suspended takeoffs across the country.

The latest crash raises fresh concerns about the safety of the 737 Max.

The number of planes taken out of service has continued at more than twice the normal daily average of 20.

While there is there is little evidence so far of increased safety risks, the rising alarm was echoed by union leaders.

Delta has had incidents in which animals attacked, bit, urinated and defecated on planes.

The jet rolled off the end of a Burbank, California runway, skidding to a stop on a crushable concrete surface.

An engine failure on a Delta jet forced pilots to shut down the turbine and return to Atlanta shortly after takeoff.