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Otis is the largest global elevator and escalator supplier by revenue with around 18% global market share. In 1854 Otis' founder and namesake Elisha Graves Otis, invented a safety mechanism that prevented elevators from falling if the hoisting cable failed. The company's product and service lifecycle begins with installations of elevator units in new buildings, later selling maintenance services on the units, and eventually replacement of the units after the average 15- to 20-year useful life of an elevator. As the largest global OEM, Otis has amassed an installed base under service that exceeds 2 million elevators. Its business model is similar to that of its closest competitors Kone, Schindler, and TK Elevator.

GE Aerospace is the global leader in designing, manufacturing, and servicing commercial aircraft turbine engines, along with partner Safran in their CFM joint venture. With its massive global installed base of nearly 80,000 commercial and military engines, GE Aerospace earns most of its profits on recurring service revenue of that equipment, which operates for decades. GE Aerospace is the remaining core business of the company formed in 1892 with historical ties to American inventor Thomas Edison; General Electric became a storied conglomerate, with peak revenue of $130 billion in 2000, until it spun off its appliance, finance, healthcare, and wind and power businesses between 2016 and 2024.