> Where was the miscommunication? The pilot readback was correct.
"Runway 4L was being used for takeoffs. The American Airlines aircraft did not follow air traffic control instructions. ATC audio shows they were told to “”cross runway 31 Left at Kilo” and instead crossed runway 4 Left at Juliet, in front of the accelerating Delta Boeing 737."
Crossing a runway, which you're not cleared to cross is a pretty bad case of miscommunication in my book.
