On 12/3 their marketing team sent an email stating that shipping would be paused for the holiday season until 1/3/26. They also stated that all unfulfilled orders would be shipped the following day, meaning 12/4. It could be that your order was somehow overlooked with the sheer volume of orders to fulfill around Black Friday. Still, no excuse.
How big was the order? I would wait until 1/3/26 and give them another week or so to catchup on unread emails (they're probably completely offline in vacation mode). Or, there's a member here #Boedinger who is supposedly a member of the Texan Airplane Store team. You can try reaching out to him. A few other members including myself have had hiccups in the past with orders placed through TAS (if you search the forum there are other threads with order inquiries), but it seems like they eventually all get resolved, not without some angst though. There's always the option to open a credit card claim, though this would just end up forcing a refund without the desired model and a potential ban from the store. Personally, I would wait. They seem like honest people and must have overlooked your order by accident. The owner is hosting the next AI convention so I especially can't see him scamming people with a subsequent risk of tarnishing his image with such high stakes at hand.