The U.S. ban on inflight smoking began with domestic flights of two hours or less in April 1988, extended to domestic flights of six hours or less in February 1990, and to all domestic and international flights in 2000. The 1990 ban applied only to the passengers and the cabin of the aircraft and not the flight deck. Pilots were allowed to continue smoking after the 1990 ban due to concerns over potential flight safety issues caused by nicotine withdrawal in chronic smokers.
when did they ban smoking on international flights
2000