CNN Erin Burnett OutFront May 23, 2014 23:03:00
They're unacceptable. they're worked on. but there is a backup system and people are safe. >> reporter: this is what can happen when planes get too close. in 1991, this usair 737 at l.a.x. landed on top of a skywest commuter plane preparing for takeoff. 34 people died. accidents like this are incredibly rare because of collision avoidance systems now mandated in planes. >> these mistakes can occur through a controller making an error, through a pilot making a mistake. but remember, there is avionics on board, particularly one called tcas, which is collision avoidance assistance. >> reporter: t...
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