Actually, the only benefits are what Loser pointed out and by staying in flight longer, assuming you get more kills, the higher your kills/sortie will be.
However!! there is a 1.25 modifier for perk points when u successfully land. If you go back out after refueling and get shot down, you do not get the bonus 25%. So if you want score, rearm, if you want perks, replane.
SKurj