um no....there already is a pelican dependencie/tag in the halo3 game(.map files) and halo3 canot be modded, well only forge modded currently, and why would you want to modify the halo2...
Unfortunately, you cannot fly a Pelican in any of the three Halo games, at any point. The only place that is likely possible is Halo PC/CE, where people make custom mods. I hope this has helped you;...