LONDON — Chinese domestic airline Loong Air has placed a letter of intent for 20 CS100 CSeries jets on Monday. The order is valued at $1.28 billion US.

The airline was founded in 2013 and hubs in Hangzhou Xiaoshan International Airport in China. It currently has a fleet on six Airbus A320 jets, with five more on order plus nine A320neo aircraft.

Monday’s announcement pushes the total number of CSeries commitments here in Farnborough to forty-four aircraft, following Saturday’s announcement from UK lessor Falko. It expands the total number of commitments for the program to 491, though firm orders remain at 203.

The order also continues to bolster confidence in the program, and quiets concerns that Saturday’s announcement would lead to a one-act show for the airplane (though chatter prior to the show indicated the possibility of two orders).

Separately, Middle Eastern carrier Falcon Aviation Services firmed its order for two CSeries CS300 airplanes. The original letter of intent was filed in late February.