Growing Asian airlines will shrink seat space even further and sacrifice legroom to squeeze more passengers onto planes, with experts predicting budget carriers are betting big on demand in the region soaring higher.

Among the leading Asian low-cost carriers making moves at the Paris Air Show this week, Cebu Pacific bought new jets to squeeze a record number of passengers onto its planes while AirAsia upgraded to the largest single-aisle jets.

Philippine carrier Cebu announced it would buy 31 Airbus "neo" planes - 16 A330-900neo widebody jets and 15 A320neos - in a US$6.8 billion (NZ$510.3 billion) deal.

AirAsia, the

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