A Jetstar passenger plane flies over an ice-cream van near Melbourne's Tullamarine Airport December 18, 2009. Two of Asia's major low-cost airlines, Malaysia's AirAsia and Qantas Airways-owned Jetstar, are in talks to form a joint venture, in a sign budget carriers are under pressure to drive costs even lower. REUTERS/Mick Tsikas (AUSTRALIA - Tags: TRANSPORT BUSINESS)