Wheels Up is an on-demand private aviation company that sells access to private jets through a membership program and a pay-as-you-go charter brokerage. The flagship Wheels Up Signature Membership charges a monthly fee and requires members to pre-load funds used to book flights at fixed or dynamic hourly rates on Wheels Up's controlled fleet, which is centered on two aircraft types: the Bombardier Challenger 300 series (midsize jet) and the Embraer Phenom 300 series (light jet). Charter customers can also book flights on demand with no upfront commitment, accessing both Wheels Up's owned fleet and a broader network of FAA-vetted third-party operators. Revenue comes primarily from flight revenue recognized when trips are flown, supplemented by monthly membership fees and ancillary services including cargo and government/defense flights. The core economic driver is aircraft utilization — Wheels Up carries fixed costs on owned and leased jets regardless of whether they fly, so filling aircraft with a mix of business and leisure travelers is key to unit economics. Wheels Up is executing a multi-year transformation focused on fleet modernization (consolidating from four legacy aircraft models to two), operational cost reduction, and deepening its partnership with Delta Air Lines. Delta is both a lender and shareholder, and the two companies are integrating sales, technology, and customer loyalty programs. Wheels Up's core operations are U.S.-focused, while international charter business runs primarily through Air Partner, its U.K.-based subsidiary operating across Europe, the Middle East, and beyond.