Wow! Get one credit card, spend $4K and you’ve got unlimited free (actually, $5.60) flights on Southwest Airlines for a companion for the rest of 2019.
If your FICO score is ~720+, and you don’t run a balance on your other credit card(s), and you sometimes fly Southwest with a friend/spouse/offspring/etc., this is a super deal.
Southwest plans to begin flying to Hawai’i this year.
My wife and I have enjoyed flying “free” with our Companion Passes for several years. Good luck!