It's well established by research that people's risk preference curves are asymmetrical.
"Pay me $1, and enjoy a 1 in 1 million chance of winning $1,000,000." - statistically, the two sides are exactly equal in value, and yet nearly everyone would take the bet.
"I'll pay you $1, in return for which you risk a 1 in 1 million chance of me taking $1,000,000 from you, or, if you haven't got that, your house, your possessions, your retirement savings." Also statistically exactly equal in value, and yet hardly anyone would take the bet.
How much more would you be willing to pay for an air ticket, to take away what published statistics indicate is about a 1 in 90,000 (Delta) to 1 in 20,000 (United, American) chance of IDB?