By 12:30 p.m. on M Street in downtown Washington, D.C., Bub and Pop's sandwich shop is buzzing. The line to order stretches out the door of the little shop, which is housed in a brightly colored English basement in a converted rowhouse.

Are airlines unfairly conniving to keep capacity low and thus drive up fares? According to Senator Richard Blumenthal, a Connecticut Democrat, they are—and he's asked the Justice Department to investigate.

This is why we can’t have nice things, New Yorkers might have muttered when they heard the news: Bill de Blasio, a shoo-in to be elected mayor next month, supports a plan to gut one of New York City’s most successful policy innovations of the past three decades.

America by Air