Asthma is a common condition that can be life-threatening, especially when the sufferer’s inhaler is in the baggage hold. In addition to oxygen,
bronchodilators and adrenaline are kept in order to open up the airways.
Dangerous breathing problems can also result from severe allergic reaction, which worries airlines so much that some no longer serve peanuts. Most carry EpiPens, as well as antihistamine and adrenaline to prevent anaphylactic shock.