The President of Singapore flew from Tashkent on an Uzbekistan Airways flight

The President of Singapore, Halima Yaqub, completed her state visit to Uzbekistan and left the country on May 25 on a Boeing 787 Dreamliner with Uzbekistan Airways flight HY511 Tashkent-Seoul.
Halima Yakub became the first president of Singapore to visit Central Asia. He paid a state visit to Kazakhstan on May 21-23 and arrived in Tashkent from Astana on May 23 by Uzbekistan Airways regular flight (HY722).

The main events of the visit, including talks with President Shavkat Mirziyoyev and a business forum of the two countries, took place on May 24 in Tashkent. On May 25, Halima Yaqub went to Samarkand on the "Afrosiyab" high-speed train.

According to Wikipedia, Singapore's president, prime minister and other dignitaries usually board regular passenger flights for travel. They mainly use the services of the national airline Singapore Airlines, depending on the route, they also fly on regular flights of other carriers.