United Airlines completed its latest phase of growth by purchasing 200 Boeing 737 Max aircraft and 70 Airbus A321neo planes.This order, which is the largest ever placed by an airline in the past decade, will enable it to increase domestic seat availability by almost 30% per departure and create approximately 25,000 new jobs.United anticipates adding more than 500 narrow-body aircraft, based on the airline's current order book. The airline currently owns 813 aircraft.40 aircraft will be added to the fleet in the next year, while 138 will arrive in 2023. 350 will fly from 2024.Cabin on United Airlines Boeing 737MaxThe airline plans to upgrade narrow-body aircraft by adding WiFi, additional seating and entertainment at every seat.More: United Airlines promises a supersonic futureAviation chiefs come together to demand an air corridor between the US and UKUnited anticipates that it will resume its full schedule of flights from Newark airport, the US, before November 2021. This is where United is the largest carrier, with over 430 daily flights.United expects that its Newark departures will increase from 55% in 2019 and to 70% by 2026, exempting domestic brand United Express.United and the Federal Aviation Administration (FAA), estimate that the new aircraft will generate more than $30 Billion in traveller spending by flying with United, and an additional $50 billion to the US economy by 2026.Scott Kirby, United chief executive, stated: The United Next vision will revolutionise flying United. We accelerate our business to meet the resurgence of air travel.We combine friendly, helpful service and the best experience in the air by quickly adding and upgrading these many aircraft with our signature interiors.This move also highlights the vital role United plays in sustaining the US economy. The addition of these aircraft will have a significant impact on our communities in terms of job creation and traveller spending as well as commerce.After two fatal crashes in which 346 people were killed, the Boeing 737 Max was allowed to fly again by US safety regulators in November 2013.