Extreme heat forces US airlines to limit passengers and fuel loads

High temperatures reduce engine performance and the lift airplane wings are able to produce, leading some airlines to warn of delays

Extreme temperatures in parts of the US and around the world are forcing airlines to reduce fuel loads, shed passengers or baggage, or wait for daytime temperatures to drop in the evenings, to fly some aircraft.

High temperatures reduce the performance of engines and the lift airplanes wings are able to produce, which is leading Las Vegas-based Allegiant Airlines to warn that they will delay flights if there's a threat to passenger safety.