Why Ice Is So Dangerous at 35,000 Feet

On a Sunday lunchtime over Florida, a Learjet 60 crossing the top of a storm told air traffic control it was picking up light ice. About three minutes later, it was on the ground.

This is what we know so far: how a jet built to cruise near the edge of the sky can lose its grip on it, what investigators are looking at, what they still need to find, and why the same physics matters for the business jets that fly out of Luton, Farnborough and Biggin Hill every day.