A fellow pilot told Boeing jet that its tire popped off before takeoff: 'It just rolled off the runway behind you'

• A pilot taxiing a nearby plane alerted the pilot of Delta Flight 982  that a wheel had popped off. 
• "It just rolled off the runway behind you," the pilot said in audio obtained by CNN. 
• The plane had been lined up on the runway in preparation for takeoff. 

A Delta plane's front wheel popped off just as it was about to take off from Atlanta over the weekend — and it was the pilot of a nearby aircraft who first noticed the runaway wheel.