Initialism of approval to connect.

(aviation) Initialism of air traffic control. / (aviation) Initialism of air traffic controller. / (rail transport) Initialism of automatic train control.

(poker) Initialism of any two (pocket) cards.

Initialism of Air Training Corps (a British youth organisation sponsored by the Ministry of Defence and the Royal Air Force).

plural of ATC

(heraldry) Alternative spelling of achievement / Archaic spelling of achievement.

River in Louisiana, major distributary of the Mississippi River.

Alternative spelling of achoo

Alternative spelling of achoo

plural of atchievement