Using airplane is the fastest...
Using airplane is the fastest way. Here, several airports in Asia that I'd ever been there; Narita (Japan), Changi (Singapore), Sepang (Malaysia) and Soekarno - Hatta (Indonesia). But several place on Asia also possible using land transportation. Like Thailand to Malaysia (via Kra) and Serawak (Malaysia) to Pontianak (Indonesia) via Entikong. Or using sea transportation, with ship or jetfoil (hovercraft). For example; from Batam, Tanjung Pinang and Pekanbaru (Indonesia) to Singapore using jetfoil, less than 2 hours.
+ Here I took picture at Soekarno - Hatta airport, pictured by Adlisal
Several public transportation are ready to you, like trains, buses, mini buses, jeepney and tuk-tuk (popular in Philippines), mikrolet, bemo and bajaj (popular in Indonesia) and becak (rickshaw).