Travel Takeout: Over sixty thousand flights have been canceled in the past four days, leaving hundreds of thousand people in Europe devising alternative travel plans. Seth Stevenson, author of “Grounded: A Down to Earth Journey Around the World” looks at their ground travel options.

Listener Takeout: By phone, on Twitter, via email and posted on our website, Takeaway Listeners told us about the global reach of the Icelandic volcano’s disruptive plumes.