stuff about the movie

I liked it when the copilot (the star of the movie) says to the passengers after the American woman breaks down, "She has a fragile psyche because her husband was killed in Vietnam by napalm that exploded in his face and split it open like a ripe cantalope" (or something like that).

Also, what was with the two pails full of gasoline?

And why was the vampire in the white suit such a slow walker, but the other vampire (the scientist, I think) near the end of the movie such a fast runner?

And how did all the people in the cars on the highway and in the building die? Did the vampires suck all their blood? If so, why didn't those people try to escape first, especially those who were in cars?

Why was there no water on the plane? And if no water, what about other beverages?