PHILADELPHIA (AP) — Messy travel appears to be the order of the day as a major winter storm in the East slowly plays itself out.

At least 21 people have died, most in traffic accidents, and thousands of airline flights have been scrapped.

Hundreds of thousands of customers from the South through the Northeast, are without electricity.

The relentless snow and ice storms this winter have led to the highest number of flight cancellations in more than 25 years.

An analysis by The Associated Press finds that U.S. airlines have canceled more than 75,000 domestic flights since Dec. 1, including roughly 14,000 this week.

Based on information provided by flight tracking site FlightAware, that's 5.5 percent of the 1.35 million flights scheduled during that period.