Three people in a flight simulator have died after a real plane crashed into the building in the United States.
The pilot of the twin-engine aircraft also died when the aircraft lost power after takeoff, and smashed into a Kansas Flight Safety centre.
The crash injured at least five others and ignited a fire that sent up towering plumes of black smoke.
Only the pilot was on the plane, but it wasn’t immediately clear how many people were inside the building at Wichita Mid-Continent Airport, US, where more than four people were found dead, authorities said.
Four more people remained unaccounted for hours after the crash, but a search was halted after a portion of the building collapsed.
Wichita Fire Marshal Brad Crisp assured onlookers the search would resume as soon as the building was stable.