I think there is also the molars and general jaw shape to consider. Carnivores are not just identified by their fangs, they have generally a different structure and layout of their jaws that is made to lock into a prey animal or tear out pieces of flesh.
In contrast, many herbivores have teeth laid out to grind down plant matter (think cows or goats) and their mouths are laid out to chew off vegetation with very articulated lips to assist. Even if these camels have pointy fangs, the rest of their mouth would indicate they eat primarily plants.
I don’t know much about it myself, but I would guess it is negligible. Maybe for small propeller machines with a fairly limited amount of fuel capacity; but larger planes, especially commercial ones, have reserve fuel for quite some time.
Situations where landing at the destination is temporarily unavailable, air traffic requires the plane to circle for some time, or they are even rerouted to a different airport can always occur and are accounted for. A minor increase from rainfall shouldn’t make a dent. I would think.