Bill Chappell

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:

Towns in Missouri, central Illinois and at least four other Midwestern states are under a flood warning, as heavy spring rains swell the Mississippi and other rivers to dangerously high crests. In some areas, rivers have already hit record flood levels.

In places where residents have been forced to evacuate their homes, the American Red Cross has set up shelters at schools and other facilities.

Hundreds of Boston-area residents gathered Sunday to pray, to sing and to remember the victims of bombs and other violence in the city this week.

Six churches organized an interfaith service near the intersection of Boylston and Berkeley streets, close to the cordoned-off area where investigators are examining the crime scene created when two bombs tragically altered the finish of the 2013 Boston Marathon.

Boston bombing suspect Dzhokhar Tsarnaev has not yet been questioned — but officials' decision not to read him his Miranda rights before interrogation is the subject of much debate.

(Most recent update: 4:20 p.m. ET)

Investigators are still waiting to interview Boston Marathon bombing suspect Dzhokhar Tsarnaev, whose wounds reportedly include injuries to his neck and leg. An official tells CNN that Tsarnaev has been "intubated and sedated," rendering him unable to speak with them.

The London Marathon observed 30 seconds of silence before the race got underway Sunday, in a show of solidarity with the victims of Monday's attack at the Boston Marathon. Many runners and spectators wore black ribbons to honor the three people killed and the more than 170 injured in two bombings.

Christopher Knight, whose 27 years of living in near-total isolation in Maine's wilderness made him an object of fascination after he was arrested for stealing food and supplies, appeared by video for a court hearing Tuesday, when a Kennebec County judge set his bail at $25,000 cash.

What does it take to ride a bicycle at 100 miles per hour? That's the question being explored by Britain's Donhou Bicycles and frame builder Tom Donhou, who has mounted a mammoth chainring onto a custom bicycle. He says the steel machine has already hit 60 miles per hour on the open road.