Before speaking to the captain, Carson sneaks down the freight deck and removes two explosives and a detonator concealed in David's casket, then goes to the Avionics Section where Julia is sleeping (presumably drugged).
Carson sneaks down the freight deck. Carson removes two explosives. Carson is speaking to the captain. A detonator concealed in David's casket goes to the Avionics Section. This is then. Julia is sleeping (presumably drugged). A detonator concealed in David's casket was speaking to the captain. This was then.