Try searching the FAQ...
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do you have a sister in Israel
(j/k ;D nevermind )
O Neil, lock the laser (if you're the black op laser d00d) upon a target, then give the a10 enough time to do TWO fly-by's, one for detecting the target & lock on it
with a lil' patience, it SHOULD work just fine.
sometimes you can boost (read : skip the fly-by's) the process by simply removing the machineGun30A10 from the plane. This way, she is forced to use the LGB's at once!