Prime Minister Srettha Thavisin is still not happy with the long queues and lengthy waits at Suvarnabhumi International Airport's immigration control, prompting him to order officials to step up efforts to address the problem.
Mr Srettha made a second surprise visit to the airport on Saturday evening following his previous unannounced visit there on Feb 5.
He said passengers were still waiting too long for key services.
The prime minister posted a message on X on Sunday, saying: "I made an unannounced visit to Suvarnabhumi airport in the evening. The previous visit was in the morning.
"This time, there were numerous passengers. I began to measure the time at the airport from when passengers get out of their vehicles, go through check-in and security systems until they reach the terminal and wait to board the planes.
"As for arrivals, I measured how long it takes for them to disembark and go through immigration. I found it took a long time," he said in the message.
"I asked officials whether they can fix a time limit [for handling each passenger going through immigration]. They said it is uncertain. This aspect needs to be improved urgently.
"I want Airports of Thailand [AoT] or immigration officials to work together to inspect the system at peak hours so they can learn about the problems and find ways to solve them. Next time, I will make another visit for a detailed inspection.
"I want officials to be service-minded and pay attention to visitors to impress them the moment they disembark. Everything should be seen as an opportunity to boost Thailand's tourism," Mr Srettha wrote.
After the Feb 5 visit, he wrote on X that passengers should take no more than 30 minutes to go through immigration. They also should not wait a long time to collect their luggage, he said.
