Question: At the end we are left with the question of the pilot's intentions, and what happened. Is he going to help them, or pull an about-face and machine-gun them down thinking they're infected?
Question: Do you know what the pilots say (and what language) at the end?
Answer: It's Finnish. They say "Lähetätkö helikopterin?" which means "Will you send a helicopter?"
Answer: That question is actually answered. The pilot is speaking Finnish, and he says into the radio "lähetätkö helikopterin" which translates as "Can you please send a helicopter?" Looks like he was actually helping them after all, and there is still some civilization (or at least people with radios and helicopters).