Airbus and Boeing have opened the 49th Annual Paris Air Show with over $20 billion in orders for more than 200 aircraft.

Airlines executives say they are interested in energy-efficient models at this year’s show. The mid-size passenger jets – the Airbus A-320 and the Boeing 737 – are receiving many inquiries.

The two major aircraft competitors are also introducing new jumbo passenger jets. One star of the show is the Airbus superjumbo A-380, while Boeing is concentrating on the 747-8 stretch jumbo jet.

Of the 140 aircraft on display at the show, a solar-powered aircraft is receiving plenty of attention. Show organizers say the Solar Impulse aircraft weights as much as a car and is powered by electric motors.

The Paris Air Show runs through June 26 and is expected to receive nearly 200,000 general public visitors. More than 200 official delegations from 88 countries will also be in attendance at this year’s show.