Embraer delivered 15 jets to the commercial aviation market and 24 business jets in Q3, being 17 light jets and 7 large jets. On September 30, Embraer's firm order backlog totaled $13.6B. In the commercial aviation market, Embraer forecasted in its Market Outlook a demand for 10,550 new aircraft with up to 150 seats worldwide over the next 20 years. The in-service fleet is set to increase to 16,000 aircraft, up from the 9,000 aircraft currently in operation. Market growth will drive 65% of this demand, while the remaining 35% of the projected demand will be to replace ageing aircraft. Embraer and Helvetic Airways signed a contract for a firm order of 12 E190-E2 jets during Q3. The contract also includes purchase rights for another 12 E190-E2 aircraft. Deliveries should occur between the end of 2019 and 2021. United Airlines made a firm order for 25 E175 jets in a 70-seat configuration. Deliveries will begin in 2Q19. Embraer also signed a contract with an undisclosed customer in Q3 for up to five E195-E2s, being three firm orders and two purchase rights. In addition, the company continues to work on finalizing its recent LoI for 100 E175 aircraft for Republic Airways, with the expectation that a significant portion of these jets should enter the company's backlog by the end of 2018. A total of 134 jets were removed from Embraer's backlog in Q3.