Reports of smoke in the cockpit forced two planes to return to their originating airports on Monday.
A Continental Connection flight headed for Newark, N.J., returned to New York's Albany International Airport shortly after takeoff because the pilots reported smoke in the cockpit.
Airport spokesman Doug Myers says maintenance crews believe the smoke was de-icing fluid vapor and the condition cleared quickly after the pilots turned off the windshield heater.
The twin-engine turboprop carrying 78 passengers had been de-iced before taking off at about 8:30 a.m. Monday.
The pilots reported the situation under control before they landed. Mechanics were checking out the plane. The flight is operated for Continental by Colgan Air.
In South Carolina, officials say a Delta plane bound for Detroit with 39 passengers aboard returned to the airport after the pilot reported smoke in the cockpit
Airport spokeswoman Rosylin Weston said the aircraft landed at Greenville-Spartanburg International Airport about 1:15 p.m. Monday. Authorities reported no injuries.
The plane stopped short of the gate to let passengers disembark, and buses returned them to the terminal. One of the airport's runways was closed briefly so the plane could be moved.
Officials say investigators are trying to determine the cause of the smoke.