Boston (and New York) are great cities to fly out of as no one airline dominates the market. Keeps prices down due to competition, at least relative other hubs.
Living in Dallas, it was either AA out of DFW or WN out of DAL if you didn’t want to connect. Of course, at the time, I kind of liked the high prices as work paid for all my travel and the higher the price of the ticket, the more miles and status earned.
I still mostly fly AA and continue to maintain their mid-tier status. Pre-Covid, good luck getting an upgrade out of DFW, LGA, BOS, etc.. In the post-Covid world, I’m batting about 75% as a platinum. Not bad!