Block-Time Charter

Block-time charter is a pre-purchase flight-hour arrangement that sits structurally between single-trip on-demand charter and fractional aircraft ownership. The customer commits to a block of hours and receives a discounted per-hour rate relative to ad-hoc charter in exchange for the volume commitment and the non-refundable deposit typically required at contract signing.

The commercial structures in the block-time market have evolved significantly since NetJets introduced the fractional ownership model in 1986 and the jet card concept emerged in the early 2000s. The current market includes three primary block-time instruments.

Jet card programs are the consumer-facing product sold by large managed-fleet operators. NetJets Marquis Jet Card (now consolidated into the NetJets card program), Wheels Up (which merged with Delta Private Jets in 2023), VistaJet Connect, and Flexjet all offer pre-purchased hour blocks — typically 25, 50, or 100 hours — against access to a specific aircraft category (light, midsize, super-midsize, large cabin, ultra-long range). The per-hour rate is fixed at purchase for the card term, typically 12 months, providing price certainty against market rate volatility. Peak and non-peak surcharges may apply depending on the program structure. Unused hours at expiry are typically forfeited or subject to a rollover fee.

Membership programs are structurally similar to jet cards but use annual membership fees plus a per-flight cost rather than pre-purchased hours as the primary commitment mechanism. Wheels Up's membership tier and Surf Air (piston/turboprop shuttle focus) are examples. The membership model appeals to customers with uncertain annual flight volumes.

Direct block-charter contracts between a corporate customer and a Part 135 operator — structured without a consumer brand intermediary — are common in corporate aviation where the flight department supplements its own owned or managed aircraft for peak periods. The contract specifies the aircraft type (or type category), the block size, the per-hour rate, guaranteed availability terms (notice period, peak-day restrictions), repositioning cost treatment, and expiry provisions. These contracts are bilateral negotiations, unlike the standardized jet card programs.

The US regulatory boundary between Part 135 charter (common carriage for compensation or hire, subject to full commercial certificate requirements) and Part 91 operations (private operations, not for compensation) is critically important in block-time structuring. A corporation that owns an aircraft and manages it through an aircraft management company — where other customers can charter the aircraft — is in Part 135 territory for those charter operations, but the owning corporation's own use of the aircraft may qualify as Part 91 if structured correctly. The FAA's Sandel Avionics case and subsequent enforcement actions have defined the boundary between lawful cost-sharing arrangements and unlawful common carriage, with particular attention to advertising, solicitation, and whether the primary purpose of the flight is the transportation of persons rather than a bona fide business purpose of the pilot-operator. An operator selling block-time must hold a Part 135 certificate; a Part 91 corporate operator cannot sell block time to unaffiliated customers.

In EASA-regulated markets, operators providing block-time charter must hold an AOC under Part-CAT (Commercial Air Transport operations), with the specific aircraft type and operational authorizations reflected in their OpsSpecs. Non-commercial (private) operators under Part-NCO cannot sell block-time to third parties. Charter brokers in Europe who arrange block-time contracts with customers but subcontract the actual flights to certificated Part-CAT AOC holders are a common intermediary structure — the broker is responsible under EU Regulation 1008/2008 Article 23 for pre-purchase price transparency, and under EU Regulation 261/2004 for delay/cancellation passenger rights where applicable.

Pricing dynamics in block-time charter reflect several cost components: guaranteed aircraft availability (the operator must have lift available on the customer's notice period, which may require positioning costs); fuel surcharge (sometimes built into the rate, sometimes variable); landing fees and navigation charges (included or excluded depending on contract structure); crew costs (always included in block-time rates, unlike dry-lease arrangements); and peak-period pricing (certain dates may be excluded from standard block-time rates — major holidays, Super Bowl weekend, Geneva Air Show week for European operators).

Fractional ownership, the adjacent product, differs from block-time in that the fractional owner holds a deeded ownership interest in a specific aircraft (1/16 share, 1/8 share, 1/4 share), receives a management agreement for the aircraft's maintenance and crew management, and has contractual access to equivalent lift when their specific aircraft is unavailable. The ownership stake creates tax and depreciation implications absent in block-time. Block-time provides no ownership interest, simpler accounting treatment, and lower commitment — the distinguishing tradeoff is flexibility versus total cost for equivalent utilization levels.

For corporate flight departments managing mixed-fleet operations — some owned aircraft, some dry-leased, and occasional block-time or on-demand charter to cover peaks — the cost benchmarking between ownership economics and block-time pricing is a recurring management question. The total ownership cost of a midsize business jet (acquisition depreciation, crew salaries, insurance, maintenance reserves, hangar, and fuel) at 300 hours per year may compare unfavorably to block-time rates for the same annual utilization once residual value risk is factored in. This comparison is highly sensitive to utilization assumptions, and the crossover point — above which ownership is economical, below which block-time is preferable — is typically in the 200–400 annual hour range depending on aircraft type and current charter market rates.

For flight schools and ATOs that manage training aircraft for corporate clients under flight training and aircraft management agreements, block-time concepts appear in the structure of pre-purchased training hour packages: a corporate client pre-purchasing a block of recurrent training hours for their flight department crew on a simulator or training aircraft at a fixed per-seat rate. The regulatory and commercial mechanics are distinct from charter block-time, but the billing structure — pre-purchased hours, debit on use, expiry, balance tracking — is structurally analogous.

Aviatize's smart planning and booking module supports block-time management for operators selling pre-purchased flight-hour packages — whether under a charter program or a pre-purchased training-hour arrangement. Block-time balances per customer are tracked in real time, depleting as flights are completed and generating alerts when a customer's balance falls below a configurable threshold requiring renewal. The availability calendar and booking system enforces the availability commitments built into the block-time contract, flagging booking requests that conflict with operator-defined peak restrictions or minimum notice requirements.

The billing and payments module generates per-flight debit statements against each customer's block-time balance and handles the non-standard billing scenarios common in block-time contracts: repositioning surcharges billed separately from blocked hours, fuel adjustments for variable fuel-cost contracts, and balance reconciliation at expiry. For operators managing multiple block-time customers simultaneously — a corporate flight department operation with five to ten active clients on different block sizes and rates — the consolidated billing dashboard provides the accounts-receivable visibility needed to manage renewal cycles and deposit requirements without manual spreadsheet tracking.