Age 67 isn't going to happen anytime soon.
Spirit may not make it through the recession which we are due. There won't be any movement in seniority or salary.
I've survived a the Great Recession, downgrade, contract concession in bankruptcy, another bankruptcy, furlough, and age 65. I started over at 58. I'm upgrading this week, after 2 years, in my home base. You don't want to be on the street when no one is hiring.