If you have some balance on your Allegiant World Mastercard, you may want to transfer it to a credit card with 0% intro APR to pay it off at no interest. There are a lot of different balance transfer credit cards with different introductory periods. You can choose the card with the most suitable introductory period. Note that once the zero introductory period is over, an ongoing APR will apply. So check out the ongoing rates before you apply. Also, balance transfers are not usually free, you may need to pay 3%-5% for each balance transfer.
Balance transfer credit cards often come with rewards and without annual fees, so it is worth to compare before you apply. Just remember that balance transfers do not earn rewards.