Need some support

I want to do something really stupid. I even have it rationalized in my brain. So I come to you all for support. Here’s the deal:
My hubby is from Texas. We in live Washington state. His mom passed away in June of 2012 and we had to drive there due to airfares. His moms passing was a wake up call for him and he wants to visit more often. He has a twin brother that lives there who before I came along was his best friend. They are still really close and talk several times a week. We were going to go visit this past April but due to finances we changed our minds and promised we would go in April of 2014. There are only three airlines that fly into the airport closes to his dad’s house. The next close airport is Dallas or Albuquerque, which is 6 hours away. For 4 tickets on Southwest (which is the cheapest) the cost is $2100. BUT (here it comes) they have a deal right now that if you apply for their credit card and spend $2000 in the next three months you get enough points for 2 round trip tickets. The annual fee is $99. So what I think is to apply for the card, pay all our monthly bills that can be paid with a credit card untill we hit the $2000 for the 2 tickets. It’s money I would be spending anyway and I know that I would pay it off before interest came due. The bad part is that our biggest bill, which is our mortgage, can’t be paid by credit card. SO we would have to use the credit card for ALL the other bills, including food and gas.