The Middle of the Market sector means the airplanes that fill the middle part of the market between the wide body aircrafts such as the A350 or the B777 and the narrow body aircrafts such as the A320 and the B737. Nowadays with the decrease of gas prices. More airlines have started to buy more of these middle of the market planes to fill the gap and make new routes more profitable. The A321 has been a hot product because it fills the margin and has good fuel efficiency. Now Airbus, who created the a321 has competition from their biggest rival Boeing. Boeing is trying to launch a product to compete with the A321. But they won’t be able to launch it until the first half of 2020s.