Spirit airlines: Ridiculously low airfares on certain dates, other routes too

Spirit airlines, a no frills airlines, is having new routes from or to DFW and so is giving v low fares to celebrate that, on CERTAIN DATES.

The dates are:

Atlanta To:Fares FromDates Available Dallas Fort Worth (DFW) $11* each way 2/14, 2/15, 2/21, 2/22, 2/28, 2/29
Boston To:Fares FromDates Available Dallas Fort Worth (DFW) $11* each way 3/27, 3/28, 4/3, 4/4, 4/10, 4/11
Dallas Fort Worth (DFW) To:Fares FromDates Available Atlanta $11* each way 2/14, 2/15, 2/21, 2/22, 2/28, 2/29 Boston $11* each way 3/27, 3/28, 4/3, 4/4, 4/10, 4/11 New York (LaGuardia) $11* each way 2/14, 2/15, 2/21, 2/22, 2/28, 2/29 Orlando $11* each way 3/27, 3/28, 4/3, 4/4, 4/10, 4/11
New York (LaGuardia) To:Fares FromDates Available Dallas Fort Worth (DFW) $11* each way 2/14, 2/15, 2/21, 2/22, 2/28, 2/29
Orlando To:Fares FromDates Available Dallas Fort Worth (DFW) $11* each way 3/27, 3/28, 4/3, 4/4, 4/10, 4/11

http://marketing.spirit.com/traveldeals/air.php?s=775&mw=1

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There is also another promo going on, which is only for members of their $9 club. This gives savings on luggage and fares...
This membership costs about $59 per annum currently and the fares and routes are:

Atlantic City To:Fares FromDates Available Fort Lauderdale $17* each way 12/11, 12/12, 12/13, 12/14, 12/15, 12/18 Myrtle Beach $17* each way 12/6, 12/11, 12/12, 12/13, 12/14, 12/15 Orlando $17* each way 12/12, 12/13, 12/14, 12/15, 12/18, 12/19 Tampa $27* each way 12/10, 12/11, 12/12, 12/13, 12/14, 12/15 West Palm Beach $17* each way 1/19, 1/20, 1/22, 1/25, 1/27, 1/29
Boston To:Fares FromDates Available Chicago (O'Hare) $9* each way 12/6, 12/7, 12/10, 12/12, 12/13, 12/14 Fort Lauderdale $27* each way 12/7, 12/10, 12/11, 12/12, 12/13, 12/14 Myrtle Beach $17* each way 12/6, 12/7, 12/11, 12/12, 12/13, 12/14
Chicago (O'Hare) To:Fares FromDates Available Boston $9* each way 12/6, 12/7, 12/10, 12/12, 12/13, 12/14 Dallas Fort Worth (DFW) $17* each way 12/5, 12/8, 12/9, 12/12, 12/13, 12/15 Detroit $9* each way 12/1, 12/2, 12/5, 12/8, 12/9, 12/14 Fort Lauderdale $17* each way 12/5, 12/12, 12/13, 1/6, 1/8, 1/10 New York (LaGuardia) $17* each way 12/4, 12/6, 12/7, 12/13, 12/14, 12/15
Dallas Fort Worth (DFW) To:Fares FromDates Available Chicago (O'Hare) $17* each way 12/4, 12/6, 12/8, 12/9, 12/11, 12/15 Fort Lauderdale $17* each way 1/6, 1/8, 1/10, 1/11, 1/12, 1/13 Las Vegas $17* each way 1/17, 1/23, 1/24, 1/29, 1/30, 1/31
Detroit To:Fares FromDates Available Chicago (O'Hare) $9* each way 12/4, 12/5, 12/6, 12/7, 12/8, 12/9 New York (LaGuardia) $17* each way 12/9, 12/10, 12/11, 12/12, 12/13, 12/14 Tampa $17* each way 12/5, 12/7, 12/8, 12/11, 12/12, 12/15
Fort Lauderdale To:Fares FromDates Available Atlantic City $17* each way 12/1, 12/2, 12/3, 12/7, 12/8, 12/25 Boston $27* each way 12/1, 12/7, 12/8, 12/9, 12/14, 12/15 Chicago (O'Hare) $17* each way 12/1, 12/2, 12/6, 12/7, 12/9, 12/15 Dallas Fort Worth (DFW) $17* each way 1/12, 1/13, 1/18, 1/19, 1/20, 1/22 Kingston, Jamaica $9* each way 1/17, 1/22, 1/24, 1/27, 1/29, 1/31 Los Angeles (LAX) $29* each way 12/2, 12/7, 12/10, 12/12, 12/14, 12/15 Myrtle Beach $17* each way 12/6, 12/7, 12/10, 12/14, 12/15, 12/25 Nassau, Bahamas $9* each way 12/3, 12/6, 12/7, 12/9, 12/11, 12/13 Orlando $9* each way 12/5, 12/7, 12/8, 12/10, 12/11, 12/14 Santo Domingo, DR $9* each way 1/20, 1/21, 1/22, 1/25, 1/26, 1/27 Washington, DC (Reagan) $17* each way 12/3, 12/7, 12/8, 12/9, 12/13, 12/14
Kingston, Jamaica To:Fares FromDates Available Fort Lauderdale $9* each way 1/20, 1/22, 1/24, 1/27, 1/29, 1/31
Las Vegas To:Fares FromDates Available Dallas Fort Worth (DFW) $17* each way 1/19, 1/20, 1/25, 1/26, 1/28, 1/31
Los Angeles (LAX) To:Fares FromDates Available Fort Lauderdale $29* each way 12/4, 12/5, 12/7, 12/9, 12/10, 12/11
Myrtle Beach To:Fares FromDates Available Atlantic City $17* each way 12/1, 12/2, 12/9, 12/14, 12/19, 12/24 Boston $17* each way 12/1, 12/2, 12/3, 12/5, 12/7, 12/8 Fort Lauderdale $17* each way 12/11, 12/12, 12/13, 12/14, 1/9, 1/15
Nassau, Bahamas To:Fares FromDates Available Fort Lauderdale $9* each way 12/3, 12/6, 12/7, 12/10, 12/13, 12/14
New York (LaGuardia) To:Fares FromDates Available Chicago (O'Hare) $17* each way 12/1, 12/7, 12/8, 12/13, 12/14, 12/15 Detroit $17* each way 12/3, 12/7, 12/8, 12/10, 12/12, 12/13
Orlando To:Fares FromDates Available Atlantic City $17* each way 12/1, 12/2, 12/15, 12/25, 1/5, 1/6 Fort Lauderdale $9* each way 12/3, 12/5, 12/6, 12/10, 12/12, 12/13
Santo Domingo, DR To:Fares FromDates Available Fort Lauderdale $9* each way 1/17, 1/21, 1/22, 1/27, 1/28, 1/29
Tampa To:Fares FromDates Available Atlantic City $27* each way 12/1, 12/2, 12/3, 12/7, 12/24, 12/25 Detroit $17* each way 12/1, 12/2, 12/7, 12/9, 12/14, 12/15
Washington, DC (Reagan) To:Fares FromDates Available Fort Lauderdale $17* each way 12/5, 12/6, 12/7, 12/12, 12/13, 12/14
West Palm Beach To:Fares FromDates Available Atlantic City $17* each way 1/17, 1/20, 1/22, 1/23, 1/26, 1/30

Remember, this is a seriously no frills airline.

You are charged for a cabin bag, check in bag, seat assignment, everything...

The baggage fees are:
http://www.spirit.com/OptionalFees.aspx#baggage-fees

The free things you can carry are (as per their website):
'one personal item free of charge per customer. Personal items (e.g. purse, small backpack, briefcase, etc.) must fit underneath the seat, so the dimensions must not exceed 16 x 14 x 12 inches (40 x 35 x 30 cm).
Additionally, the following carry-on items are not counted towards a customer's carry-on bag allowance and can be brought with you on all flights free of charge - umbrella, camera, infant diaper bag, assistive devices, outer garments (e.g. coats, hats, and wraps), stroller, reading material, and food for the flight.
In certain instances, wheelchairs [custhelp.com], car seats [custhelp.com] and strollers [custhelp.com] may be checked or carried on free of charge.'