> It seems likely that the A319 is dead and Airbus will rely on the C300 for that segment. That's because the A320 was bigger than the 737 from the start. This

> It seems likely that the A319 is dead and Airbus will rely on the C300 for that segment. That's because the A320 was bigger than the 737 from the start. This means the 319 (and the 318 to a much higher degree) was heavier for its number of passengers than it needed to be, while the 737 was right at its sweet-spot. More weight always means higher cost to operate. Higher cost to operate per passenger always means lower margins for the airlines. This trade-off exists with every airliner. Still, airlines bought both 318 and 319 because those planes are able to take off with the same amount of fuel as the 320, giving them the longer range that was necessary to fly certain routes. (London - New York being the obvious example for the 318.) The new engines and wing tips of the 320neo family have yielded range increases that were sufficiently high to make the 320neo and 321neo able to fly those routes that the 319 had been used for before and the planned 321neo LR ("long range") is going to do the same for the 318's routes. At the same time, Boeing is now offering the similarly re-engined 737 at a much lower price that Airbus will want to sell the 319 at. Thus the 318 did not even get a neo version and the 319neo has not sold well. A similar growth has happened with the 737 family. Which is exactly why Bombardier decided to target the absolute lowest end of the 737's market and the passanger/range area below that. It's just not worth it for Airbus and Boeing to design an entirely new plane in this segment, but their existing products are too heavy to compete against the C-series. Boeing decided to compete by selling their planes at very high discounts, which Airbus is unwilling to do because of the high demand for the 320neo family. Buying into the C-series solves this issue marvelously for them. Now they have a better product than Boeing across the entire single aisle airliner market. (Mostly because those products are significantly younger than the 737, the only single aisle Boeing still in production.) They have defeated the threat posed by a new single aisle airliner that Airbus just could not compete with in its specific segment. They could even use the C-series to relieve pressure on their 320 family production lines, which are projected to be unable to keep up with demand for many years. Offer those airlines that would be a good fit for the 319neo, but will go for the much cheaper to buy 737, a C300 instead.