Do you need a vaccine passport for domestic flights in Thailand, specifically from Phuket to Chiang Mai?

Travelers flying domestically in Thailand, such as from Phuket to Chiang Mai on airlines like Vietjet and AirAsia, are not currently required to present a vaccine passport. Comments from travelers indicate that they have flown multiple routes without being asked for vaccination proof. While there were previous regulations in certain areas, these have largely been lifted.