Virus on plane

Hi guys,

I remember only little parts of the movie from my childhood.

The movie was about a flight, where there was some virus that was spreading quite quickly (“normal” virus, no zombies etc.). Some people on the flight died, and the cabin crew put blankets over them. Also, there was a vaccine for it, but there was not enough vaccine for all passengers. Some of them wanted to split one vaccine for two passengers, but someone said that it wouldn’t be effective (virus could survive only half of the vaccine). That’s all I remember.

Does anyone know?

thanks