At the latest National Transportation Safety Board ( NTSB ) press conference, NTSB Chair Jennifer Homendy shared the NTSB’s latest, best recollection of events before the mid air collision of American Airlines Flight 5342 with a Sikorsky UH-60 Blackhawk. It appears a key air traffic transmission was blocked by an attempt by the Black Hawk to reply.

The crew of the Army helicopter that hit a jet may have had inaccurate altitude readings and may not have heard air traffic controllers' instructions, officials say.

It is likely the Black Hawk pilots “stepped on” the communication for less than a second by pressing the microphone key to communicate back to the control tower, she said.