T 1, T2 and Singapore Changi Airport T3 are all connected, and there is no need to enter or leave the port between them. However, T4 has no contact with them, but it needs entry and exit. After leaving the country with a boarding pass, you can only arrive at the boarding gate 5 1.

Airports, also known as airports and airports, are more formally called air terminals. Airports come in different sizes. In addition to the runway, the airport usually has tower, apron, air passenger station, maintenance workshop and other facilities.