Your carrier tells you which type of plane you're on. As you've noticed, there are also other sources for this information. Most of Southwest's fleet are stand

Your carrier tells you which type of plane you're on. As you've noticed, there are also other sources for this information. Most of Southwest's fleet are standard 737s. If you're not that familiar with the various models, it's probably not worth making a rash decision over. Regardless, this will be sorted out, one way or another, in a month. I did care enough to ensure my Southwest flight 2 days ago was not on a Max, though.