Will my sons be able to fly back to Phuket after applying for new passports in Chiang Mai?

Traveling back to Phuket after applying for new passports in Chiang Mai may pose challenges, particularly regarding boarding the flight without the passports. Most airlines require passengers to present their valid passport for boarding, and concerns were raised about the inability to retain old passports during the renewal process. Alternatives, such as traveling by train, may be considered if there is uncertainty about the airline's policy on allowing minors to board without their passports.