In several scenes that show planes taking off from the aircraft carrier, it's very obvious that the planes haven't just taken off because you can see the jet contrails in the sky coming from the side.
With regard to "mwdelta's" comment about the inaccuracy of con-trails coming out of the aircraft immediately after take off, he/she is correct in a sense that con-trails don't form in low altitude. What he/she misses is the fact that in these shots, these "con-trails" are in fact fuel vapour coming from the fuel vents at the end of the wings, which are in all aircraft.
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Contrails (condensation trails) can form at high and low altitudes. The ones seen at high levels are from engine exhausts, water vapour being a by-product of the burning of hydrocarbons. Low level condensation is produced as a result of reduced air pressure in the center of the vortices formed by wing-tips, flaps when extended and propellor tips. The latter is only seen on humid days.
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