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Many airline passengers saw only moderate flight delays stemming from the first full day of furloughs for nearly 15,000 flight controllers and other Federal Aviation Administration workers, as industry analysts' worst fears did not materialize. But the reduced staffing was blamed for some slowdowns, and observers say it also increased the length of unrelated delays.

We'll be keeping an eye on possible delays today, and updating this post with new information.

Update at 6:45 p.m. ET. Delays Build, Many Tied To Weather:

The two suspects in the Boston Marathon bombing were ethnically Chechen. The central Asian region of Chechnya has a troubled history. It has also seen some of that region's most notorious terrorist incidents in recent memory. Host Michel Martin learns more from Alexey Malashenko of the Carnegie Endowment for International Peace.

Social media played a large role in the investigation and reporting of the Boston Marathon bombing case. It also provided many hateful, racist comments online. But what does the reaction to it all signal about greater society? Host Michel Martin talks about that with Michael Skolnik, editor-in-chief of GlobalGrind.com, and with Rey Junco of Harvard's Berkman Center for Internet & Society.

It's been a week since the Boston Marathon bombing, and people are still wondering why they happened. Media sources have suggested possible motivations, like the suspects turning to radical Islam. Host Michel Martin gets perspective on how young Muslims are reacting to this case, and how Islamic extremists are spotted. She hears from AbdelRahman Murphy, a youth director at a Tennessee mosque; and Mohamed Elibiary, who works with radicalized Muslim youth.

Freshman Sen. Rand Paul insists that he won't decide until next year whether a 2016 presidential run is in his future.

But comments the Kentucky Tea Party Republican made this week at a newsmaker breakfast about a run — "we're considering it" — as well as upcoming speaking engagements in early caucus and primary states Iowa and New Hampshire suggest serious consideration.