PassApp is the biggest taxi chain in Cambodia. You can book fast taxi in Phnom Penh, Siem Reap, Battambang, Sihanoukville, Kampot, Poipet City. We support transfers to the airport. Our services. With our app a cab, tuktuk, rickshaw with taximeter can be booked wherever we go to or from the airport, running late for work or getting home late at night.