Question: The 56th Air Refueling Squadron is an active unit of the United States Air Force, it operates Boeing KC-46 Pegasus aircraft, conducting initial and advanced aircrew training for air refueling operations, the Boeing KC-46 Pegasus is a military aerial refueling and strategic military transport aircraft developed by Boeing, from which one of its jet airliner?

Context paragraphs:
730th Air Mobility Training Squadron: The 730th Air Mobility Training Squadron is an Air Force reserve unit stationed at Altus Air Force Base, Oklahoma, where it trans airmen on Boeing C-17 Globemaster III, Boeing KC-135 Stratotanker and Boeing KC-46 Pegasus aircraft systems.  It is assigned to the 507th Operations Group at Tinker Air Force Base, Oklahoma, but performs its training mission under the direction of the 97th Air Mobility Wing of Air Education and Training Command.

349th Air Refueling Squadron: The 349th Air Refueling Squadron is part of the 22d Air Refueling Wing at McConnell Air Force Base, Kansas.  It operates the Boeing KC-135 Stratotanker aircraft conducting aerial refueling missions.

Boeing KC-46 Pegasus: The Boeing KC-46 Pegasus is a military aerial refueling and strategic military transport aircraft developed by Boeing from its 767 jet airliner.  In February 2011, the tanker was selected by the United States Air Force (USAF) as the winner in the KC-X tanker competition to replace older KC-135 Stratotankers.  The first 18 combat-ready aircraft are scheduled to be delivered to the U.S. Air Force in early 2018 under the terms of the development contract.

905th Air Refueling Squadron: The 905th Air Refueling Squadron is an inactive United States Air Force unit.  It was last active as an element of the 319th Air Refueling Wing at Grand Forks Air Force Base, North Dakota, where it operated Boeing KC-135 Stratotanker aircraft.  The squadron was inactivated at the end of 2010 when the 319th wing lost its operational mission and became the 319th Air Base Wing.

Omega Aerial Refueling Services: Omega Air Refueling is a company which provides aerial refueling services for military units.  According to the company's website, Omega developed the first commercial aerial refueling aircraft in 1999, and has provided aerial refueling services under contract to the United States Navy since 2001.  The company has also been engaged to support Royal Australian Air Force training exercises due to delays to the delivery of the Air Force's KC-30A tankers.  In addition, Omega Air Refueling states that it has been contracted to support deployments by the British Royal Air Force and the Royal Canadian Air Force.

344th Air Refueling Squadron: The 344th Air Refueling Squadron is part of the 22d Air Refueling Wing at McConnell Air Force Base, Kansas.  It operates the Boeing KC-135 Stratotanker aircraft conducting aerial refueling missions.

924th Air Refueling Squadron: The 924th Air Refueling Squadron is an active United States Air Force associate unit.  It is assigned to the 931st Operations Group at McConnell Air Force Base, Kansas.  The squadron is the first Air Force Reserve Command unit dedicated to flying the Boeing KC-46 Pegasus.

56th Air Refueling Squadron: The 56th Air Refueling Squadron is an active unit of the United States Air Force.  It is part of the 97th Operations Group at Altus Air Force Base, Oklahoma.  It operates Boeing KC-46 Pegasus aircraft, conducting initial and advanced aircrew training for air refueling operations.

350th Air Refueling Squadron: The 350th Air Refueling Squadron is a United States Air Force unit assigned to the 22nd Air Refueling Wing at McConnell Air Force Base, Kansas.  It operates Boeing KC-135 Stratotanker aircraft conducting air refueling missions.

99th Air Refueling Squadron: The 99th Air Refueling Squadron is part of the 6th Air Mobility Wing at MacDill Air Force Base, Florida, but is stationed at Birmingham Air National Guard Base, Alabama.  It is an Active Associate Unit, an active duty component attached to the Alabama Air National Guard's 117th Air Refueling Wing.  The 99th Air Refueling Squadron works with, supports and flies the 117th Air Refueling Wing's Boeing KC-135R Stratotanker aircraft.

Supporting paragraphs: 56th Air Refueling Squadron Boeing KC-46 Pegasus
Answer: 767