Update: Still alive on March 19 (sample dates February 3 - 10) for $257 in Norwegian Krone.

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Frontier Airlines is having a one day sale today with fares from $19 to $49 from Atlanta, Georgia to:

Austin
Chicago-O’Hare
Cincinnati
Cleveland
Denver
Indianapolis
Las Vegas
Los Angeles
Miami
Minneapolis/St. Paul
New Orleans
New York-La Guardia
Orlando
Philadelphia
Trenton/Princeton
Washington-Dulles

Tickets must be purchased by 11:59 PM ET today (February 24) for nonstop travel on:

April 30, 2015
May 5, 6, 12, 13, 19, 20, 27, 2015

These are all Wednesdays and Thursdays.

These promotional fares sell out really quickly.

Through 11:59 PM tomorrow February 25, 2015, British Airways is offering a 50% bonus on the purchase of Avios. This is the biggest bonus ever offered on the purchase of Avios.

The maximum Avios you can purchase in a year is 35,000. With a 50% bonus, that means you can add 52,500 Avios to your account.

Update: This fantastic deal ends in five days on February 28!

Update 2/18/15: According to a Mommy Points/Hyatt Concierge conversation on Twitter, you can get the Hyatt card now and register for the promo by March 31, and you'll get a 20% rebate on all awards. You'll even retroactively get 20% back on the awards between now and when you register.

United has posted a statement saying that it will not honor the mistake fares I posted about this morning that allowed one way or roundtrip First Class bookings from the United Kingdom to the United States for $100 or so. Here is the entire statement:
United is voiding the bookings of several thousand individuals who were attempting to take advantage of an error a third-party software provider made when it applied an incorrect currency exchange rate, despite United having properly filed its fares.

United has posted a statement saying that it will not honor the mistake fares I posted about this morning that allowed one way or roundtrip First Class bookings from the United Kingdom to the United States for $100 or so. Here is the entire statement:
United is voiding the bookings of several thousand individuals who were attempting to take advantage of an error a third-party software provider made when it applied an incorrect currency exchange rate, despite United having properly filed its fares.

Update: Deal is dead. Hopefully if you saw this post this morning, you booked immediately like I suggested. It wasn't too hard to spot that this deal was too good to last. Also hopefully, the bookings made are honored.

Expedia is running a promo.

La Compagnie, a new French airline with an all Business Class fleet, is offering $1,007 roundtrip fares from Newark to London-Luton for travel from April 24 to June 30, 2015.

Even though La Compagnie has the worst transatlantic Business Class, the offering is far better than anyone else's economy or Premium Economy, and at a lower price, so this is a great deal.
The Deal
La Compagnie begins service from Newark to London-Luton, which is an airport dominated by low-cost carriers like easyJet and Wizz Air, on April 24, 2015.

United.com is offering cheaper prices for partner Business Class award award bookings than what United's chart says the price is. This sale is unannounced and could end at any time.

In February 2014, United went to two charts: a cheaper one for flights on United and a more expensive one for partner flights--way more expensive in Business and First Class.

Last month, there were unannounced sales in partner Business Class to Europe, the Middle East, and India. These sales were restricted to off peak times though--January, February, and March.