(NYSE: AL) for three 787-9s and 20 737 MAX aircraft.
European arch-rival Airbus had forecast last week that the world's passenger fleet would more than double to 48,000 aircraft over the next 20 years, on the back of keen demand from emerging economies and low-priced airlines.
The US$23 billion AirAsia deal would give a boost to Airbus' slow-selling A330neo wide-body, while adding to the order pile for the popular A320neo narrowbody family.
After Prime Minister Theresa May unveiled more conciliatory proposals last week for Britain to retain strong trading ties with the European Union after Brexit, Enders however said that the government was now "going in the right direction".
She said Britain wanted to "continue as world leaders in innovation" and announced £343 million ($456 million, 389 million euros) in public-private investment in innovative research and development, including new electric aircraft technology.
The U.S. industrial conglomerate needs to do further work on the proposals, especially since Boeing has yet to decide whether to recruit an exclusive turbine provider or involve two competing suppliers, GE Aviation chief David Joyce said Monday at the Farnborough air show.
"While Trump has said trade wars are 'good and easy to win, ' aviation experts say American companies like Chicago-based Boeing will take the first hit because most of US aerospace production goes to foreign buyers".
Qatar Airways has finalized an order to buy five 777 freighters from US planemaker Boeing (BA.N), the two companies said on Monday.
Sichuan Airlines is interested in 10 A350-900s, an order worth $3.2 billion.
"We continue to see the aerospace market grow very strongly", Boeing's chief executive Dennis Muilenberg said on the eve of the Farnborough show, echoing similar comments by Airbus.
Another two lessors, Goshawk Aviation and Macquarie AirFinance, each signed firm orders for 20 A320neos, worth USD$4.4 billion in total at list prices.
Organisers also warned that aircraft could stop flying if May fails to clinch an adequate Brexit deal with Brussels.
Air freight demand is expected to increase 4 percent this year, according to the International Air Transport Association (IATA).
Africa's biggest airline had been looking at Bombardier's C Series aircraft - since taken over by Airbus SE and renamed the A220 - together with Embraer's E195.
The chief executive of US aerospace and defense giant Boeing has claimed tariffs and other trade restrictions could harm global economic growth. Boeing 737 jets from the current fleet will instead be used while the airline studies passenger trends.
The prime minister will also say that her Brexit plan will secure millions of aviation jobs in Britain.