First officer found sleeping at controls of a Transavia 737 , says Dutch airline . U.S. airlines also require a flight attendant to be in the cockpit when the pilot or first officer take bathroom breaks , in case the person flying the aircraft becomes incapacitated . Returning from a bathroom break , the pilot could n't immediately enter the cockpit . The first officer was asleep in his seat and did not wake up until he saw smoke coming out of the left side of the plane. The incident took place in September en route from Greece , Dutch officials say .
First officer found sleeping at controls of a Transavia 737 , says Dutch airline . Returning from a bathroom break , the pilot could n't immediately enter the cockpit . The first officer was asleep in his seat and did not wake up until he saw smoke coming out of the left side of the plane. The incident took place in September en route from Greece , Dutch officials say .