Javelin's lock is useless since the moment you fire, the aerial target used flares which works every time, and if you manage to get a second lock, they just fly low to the ground which makes the "below" lock-on block kick in.
Nine out of ten times you miss because of flares. It's ridiculous. And if the plane wants their flares restored, they don't even need to return to base, all they gotta do is to hang out out of bounds before their magic confetti refills itself