The Airbus A319neo had 55 orders placed before February 2017 while the A320neo had more than 3,625 and the A321neo had more than 1,385 .
These improvements in combination are predicted to result in 15 % lower fuel consumption per aircraft , 8 % lower operating costs , reduced noise production , and a reduction of nitrogen oxide ( NOx ) emissions by at least 10 % compared to the A320 series , as well as an increase in range of approximately .The A319neo is the least popular variant of the Airbus A320neo family , with total orders for only 55 aircraft placed as of 28 February 2017 , compared with 3,624 for the A320neo and 1,384 for the A321neo. The Airbus A319 MPA ( Maritime Patrol Aircraft ) is derived from a military version of the Airbus A319 .
Airbus A319