The airline said that aircraft windows are made of multiple panes and that the crack was in the outer pane.
None of the 81 passengers on the plane was injured and Southwest said its pilots did not request an emergency landing.
There was no depressurization in the cabin, and therefore the oxygen masks were not deployed, FAA spokesman Greg Martin said.
Images posted online seem to show that the damaged window was just behind and above the engine on the left wing of the plane.
The timing of the incident could hardly be worse for Dallas-based Southwest, the nation's fourth-biggest airline.
Southwest estimates the drop in sales will cost the company between $50m and $100m (£37m and £74m).
Last month, the Southwest flight in the headlines had a hole punched clean through the window when an engine broke apart at 30,000 feet, sending [VIDEO]shrapnel into the plane's body and shattering the window.
Whether Manafort colluded with Russian government officials as Russia was trying to meddle in the 2016 USA election. Ellis III suggested that the reason prosecutors were going after Manafort was to try to get him to flip on Trump.
Daniels, whose real name is Stephanie Clifford, had agreed to cooperate with an In Touch magazine article on Trump in May 2011. The payment is going to turn out to be "perfectly legal", Giuliani said in an interview with Fox News' Sean Hannity .
Asian shares slipped as hopes waned for real progress in Sino-U.S. trade talks, which are due to kick off on Thursday. The U.S. dollar bought 109.68 Japanese yen, lower than 109.80 Japanese yen of the previous session.
Abe is only the third Japanese prime minister to visit Israel since the two countries established diplomatic relations in 1954. Netanyahu said Israel "would love to have [Trump]" attend the ceremony, though it's unclear if the president will be there.
And playing behind the durable Witten, he'd managed a paltry nine catches in 28 games over three seasons of work. ESPN.com's Todd Archer reported Witten will join ESPN's broadcast of Monday Night Football .
The wide spectrum of products includes air purifiers, rice cooker, wearables, electric scooter, Mi TV, Mi Drone and etc. It also said it made a net loss of 43.89 billion yuan versus a profit of 491.6 million yuan in 2016.
Rain and drizzle in the west will spread eastwards to all areas this morning and will continue for much of the day". It states: "Cool, bright and breezy tomorrow with sunny spells and scattered showers, some heavy".
March's drop in core capital goods orders and shipments suggest business spending on equipment is slowing. Despite the reduction in March, the trade gap is up 18.5 percent to $163.4 billion so far this year.
The series was the first original half-hour comedy show that the streaming site premiered, and it became and an immediate classic. Creator Tina Fey also appeared several times in the show, once as a prosecutor and later as a therapist to Kimmy .
Authorities are investigating a possible explosion in North Haven , Connecticut, according to a law enforcement official. He remarked: " This started late this afternoon with what was apparently a very violent domestic call ".
United Nations chief warns against scrapping Iran nuke deal
JCPOA sets up limits on Iranian nuclear actions in exchange for the suspension of financial sanctions against Iran by the West. The U.S. -plus China, Russia, Germany, France , Britain and the European Union -all have gotten what they asked for.
Dust storm kills at least 91, injures over 160 in India
At least 90 people were killed as squalls and dust storms tore across parts of northern India , weeks ahead of the monsoon rains. Media reports said more than 20 people were found dead in the village of Kheragarh southwest of Agra.
Facebook glitch: Is this cat picture hate speech?
Some noted that it appeared to be a bug on Facebook's part, offering "test" options to people who clicked yes. Facebook said it was "an internal test" and that a bug caused it to accidentally launch publicly.
Pranksters hang auto from Toronto overpass
Officials say they initially thought it might have been hung there as part of a movie shoot, but that theory was later ruled out. A blue sedan was spotted swaying back-and-forth from a rope underneath the Millwood Overpass Bridge, south of Don Mills Road.