Over the last eight days, nearly 700 flights have been canceled at Newark Liberty International Airport and hundreds more have been delayed by two hours or more. Late last week, 20% of air traffic controllers in Philadelphia walked off the job, frustrated with the ongoing issues, a source familiar with the situation told CBS News. U.S. Transportation Secretary Sean Duffy is expected to announce the details of a plan to revamp the decades-old air traffic control system this week. | CBS Mornings

BREAKING: Newark Airport remains closed until 11 p.m. Wednesday after a ground stop was issued due to an aircraft emergency. Port Authority of New York and New Jersey said a JetBlue flight heading to Palm Beach, Florida, reported smoke in the cockpit and immediately turned around after experiencing engine failure. https://cbsn.ws/3MROND4 | CBS Evening News

The situation at Newark Airport is improving, but it's improving slowly. CBS News' Kris Van Cleave breaks down the latest on the construction projects, technical upgrades, air traffic controller training, and more underway to ease flight delays and cancellations that have plagued the airport this year. | CBS News