Aviation

Riyadh's main airport was declared back to normal less than two days before the deadliest strike yet. Here is what the airport's notices, the airlines and Europe's air-safety regulator are saying, and what to do with a booking this week.

Winter turbulence isn't a myth: clear-air turbulence has intensified 41% since 1971, and the jet stream's widest temperature swings happen in the cold months.

Cruising-altitude air holds almost no moisture to begin with, and the engineering that makes a cabin breathable squeezes out most of what little is left.

An FAA order to inspect 471 Boeing 737 MAX jets sounds alarming. The mechanism behind it, and why no cracks have actually turned up on the model, explains why airlines aren't changing their schedules.

Planes chase headwinds on purpose: a 20-knot wind at the nose can cut takeoff and landing ground speeds by 20 knots or more, which is why runways face different directions depending on the day.

The fifth offer in 23 days finally moved easyJet's board. What Castlelake gets for £5.2bn, and why the deal needs a 51 percent European wrapper.