I recently found out that the Executive Aisle is only available when you rent a midsize or above in your initial reservation. For the last 6-8 months I've been renting the economy and compact class and taking Emerald Aisle and Executive Aisle because I didn't know better. No one has ever said anything to me and I've never been charged extra in my final reservation. Has anyone else encountered this? Is this something I should be cautious of? I have a few upcoming reservations at the lower classes since they were booked before I found out. Thoughts?