On the sixth day of my weeklong odyssey across America by air, I found myself wedged into a middle seat in the far reaches of a flight from Des Moines to Phoenix, wearing the sweatpants I had slept in. Angry at the in-flight movie system and feeling hungry, I turned to my carry-on lunch: a container of yogurt.

The yogurt had spent the flight in the seat pocket, building up internal pressure. As I removed the top, it exploded, spraying blobs onto me, the seat, the floor and a nearby man whose mood was not enhanced by the arrival of a wet vanilla-flavored substance in his hair. I never did have lunch that day.

As flights go, it was not a personal success. But anyone who travels knows that wretchedness on a plane is only a matter of degree and never confined to a single passenger. The unfriendliness of the skies seems to grow only more baroquely awful with each new incident immortalized on a cellphone.

A man is dragged off an oversold United flight in Chicago. Passengers are menaced by an American Airlines flight attendant who has wrested a stroller from a sobbing mother. A father on Delta is threatened with the confiscation of his children unless he relinquishes a seat he has paid for.