During the Saturday event Wings Over Dallas, two vintage aircraft collided in the air and crashed, according to the organizers.
At the Dallas Executive Airport, WWII fighter plane flying demonstrations were part of the event.
"The investigation and identification of the deceased will be worked on by the authorities today.
Please offer prayers for their families and everyone involved "Clay Jenkins, the Dallas County Judge, stated on Sunday.
According to the Federal Aviation Administration, a Boeing B-17 Flying Fortress and a Bell P-63 Kingcobra collided and crashed at 1:20 p.m. local time.
According to Michael Graham, a member of the National Transportation Safety Board, five of the victims were on the B-17 and one victim was on the P-63 when they collided.