He says he was 'trying to identify' the offending aircraft, which could be complete crap. I mean if he lives under the flightpath he is hardly going to discover to his amazement that 'bugger me, thats actually an F15E' is he?
Therefore it may implied he intended to disrupt or prejudice the safety of the aircraft.
One could also reasonably argue that a reasonable person would understand that shining a spotlight at an aircraft at night would lead to a compromise in safety, therefore its definitely reckless endangerment.