That would be Tulsa, because that's where I usually start and end my trips haha. At least recently. Historically, I've been to DFW more times than any other airport simply because I connected through there A LOT for many years.
I have been on some aircraft's first flight. So, Breeze Airways A220 which was listed as "brand-new" on age. I took Alaska's first 737-9 Max flight, but to be fair, it had been sitting for awhile due to the Max grounding. So, by age, probably Breeze's inaugural A220 flight.