A pilot fainted during a flight to Lisbon. It's a reminder of why commercial airplanes should always have 2 pilots.

• An easyJet pilot fainted during a flight from London to Lisbon on Saturday.
• The captain landed the plane safely, highlighting the importance of the two-pilot rule.
• Regulators and pilot unions oppose single-pilot operations, citing safety concerns.

Passengers don't usually get on a flight expecting their pilot to fall ill.

But on the rare occasion that it does happen, the two-pilot minimum rule means somebody can land the plane safely.

On Saturday, for example, an easyJet pilot fainted during a flight from London to Lisbon with nearly 200 passengers on board.