Not after his first turn, but he'll be withiin charge range for the next one (i.e. his turn after the DM post I'm about to make.) I believe a character can fly-charge provided they meet the usual conditions: not slowed by terrain, moves in a straight line to nearest square from which they can attack the foe, which he does. Nonmassive trees don't slow movement AFAICT. Which is to say, nothing in the SRD says they do (probably because they didn't think about flyers and figured it would be redundant with the 1/2 groundspeed of off-trail forest terrain. Hey, if they could fly at top speed through those trees in Return of the Jedi...)