(BBC NEWS) — The biggest aerospace event of the year takes off in Paris this week with the two sectors that make up the industry in different moods.
On the civil side, aircraft manufacturers are buoyant, with new products to display and a record backlog of orders.
In contrast, the military sector is less confident. Defence budget cuts, particularly in Washington, has meant arms programmes being scaled back or abandoned.
Optimism among commercial aircraft makers was underlined last week when Boeing published its closely-watched annual forecast for aircraft demand over the next 20 years.