AirAsia is Southeast Asia's dominant low-cost carrier — named world's best low-cost airline by Skytrax in 2025 — and for Brompton riders based in Bali, Singapore, Kuala Lumpur or Bangkok, it is the most important airline in this guide. AirAsia classifies bicycles as sports equipment requiring a dedicated sports equipment allowance, purchased separately and not combinable with standard checked baggage. The allowance comes in tiers of 20, 25, 30 and 40kg. Key note: checked baggage is not included in most AirAsia fares by default — purchase both allowances when booking.