Turn the problem into an advantage: One may obtain ritually pure breathing air for all on board by sucking the air from the bag into the cabin and blowing in fresh air for the Kohen every few minutes. The person in the bag will ritually purify the air inside the bag just by being in contact with it. As a result everybody on board will enjoy ritually pure air, especially on long flights.
15 police officers killed in Colombia helicopter crash (Reuters)
from the article: Ultra-Orthodox passengers riot aboard El Al plane over screening of film