2. Air freshener
As we detailed in “This Flight Attendant Hack Banishes Nasty Bathroom Smells,” flight crews have been using coffee to spare passengers’ noses for years.
Some freshen the air with the aroma wafting from a pot of coffee. Others have given passengers bags of coffee to hold up to their noses.
A 2012 study even found that caffeinated coffee can wipe out hydrogen sulfide gas — the chemical responsible for the stink of raw sewage.