Economy has also been filling up lately, and they've been marking down CTA parking. I tend to use Economy for personal travel (longer) and CTA for work (usually shorter), but I've gotten good enough discounts that I've used CTA for longer trips. They don't mark down all the CTA structures the same, or consistently. Sometimes P7 will be cheaper, sometimes P1. Sometimes P6. I mostly fly out of T6 and T7, but I've used P1 a few times lately when it was very discounted and it's also easier to get out of the airport because it dumps you onto Center Way with no traffic, while P7 puts you in the left lane of World Way and you have to work a little to get to the ramp for SB Sepulveda. It's also a super short walk from P1 to T7, especially if you park far from T1 (where none of the T1 pax want to park, anyway).