you really dont know your job. I got denied entry while I was entering Thailand from Cambodia by land in 2018. Nobody detained me ,I was sent back to Cambodia. I bought a flight ticket to Thailand and entered by air without any problem.
it is not deport. It is denied entry. They are different things. Immıgration officer can deny a tourist 's entry for any reason. Nobody can get guarantee to enter the foreigner country.
boarding does not mean to enter the foreigner country. Our entry is denied or accepted by immigration officer at the airport.Deciding if I am a geniue tourist or beliving if may overstay my visa is non of airline's business. It is immigration 's business.