The software system named MCAS (Maneuvering Characteristics Augmentation System) which adjusts the pitch of the aircraft after takeoff has been redesigned and tested extensively. A second outside sensor and redundant systems have been added. Additional pilot training modules have been developed and airlines are sending pilots to flight simulators. Hopefully, it all will work and airlines can phase the Max back into service. U.S. based carriers Southwest, American and United aren't scheduling 737 Max flights until at least next March. Meanwhile, the service disruption costs are mounting. Boeing has had its share of mega-challenges before and survived. For example, on Oct. 30, 1935, it was demonstrating the new B-17 to the U.S. Army Air Corps brass. The flight was part of Boeing's bid to win the bomber contract. Shortly after takeoff from Boeing Field in South Seattle, the "Flying Fortress" took a nose dive into the ground killing the pilot and injuring several others on board.