Sign-up bonuses on Southwest Airlines-branded credit cards will spike to 75,000 Rapid Rewards points, as Americans head into summer 2022 amid rocketing airfares. Bonus details The new bonus is: Earn 75,000 Rapid Rewards points after spending $5,000 on qualifying purchases in the first 3 months from account opening. The new bonus applies to these three... Gregory Karp writes for NerdWallet.