Virgin Atlantic : We have no evidence that both pilots were asleep simultaneously . Pilots of Dutch airline slept in the cockpit at 30,000 feet , Amsterdam aviation officials say . Report : The incident was `` due to longer duty period with insufficient opportunity to sleep '' Some countries allow 144 pilot at a time to sleep in the cockpit , under certain circumstances .
Virgin Atlantic : We have no evidence that both pilots were asleep simultaneously . Pilots of British airline slept in the cockpit at 30,000 feet , UK aviation officials say . Report : The incident was `` due to longer duty period with insufficient opportunity to sleep '' Some countries allow one pilot at a time to sleep in the cockpit , under certain circumstances .