Jet card vs on-demand charter vs empty legs

The three ways to fly private, summarised

Every private flyer is choosing between the same three underlying models, whatever a specific operator calls its product. Understanding the mechanics behind each is the fastest way to work out which actually fits how you fly:

• Jet card / membership. You prepay for a block of flight hours or a guaranteed number of flights per year, typically with a fixed hourly rate locked in for the term. In exchange, you get guaranteed availability — the operator commits to having an aircraft ready within a set callout window, regardless of demand.
• On-demand charter. No prepayment, no commitment. You request a quote for a specific route and date, pay full rate for that trip, and the operator sources or positions an aircraft to fly it. Complete control over your itinerary, at full price.
• Empty legs. No commitment, no membership — you're buying a specific flight the aircraft was already going to make, at a steep discount, on a fixed route and date you don't set.

The genuine trade-off across all three is the same axis every time: commitment and cost versus flexibility and control. Nobody gets all four.

How jet cards actually work, and who they're for

A jet card is fundamentally an availability product, not a savings product. You prepay a lump sum — often £100,000 or more for a meaningful number of hours — in exchange for a locked hourly rate and a contractual guarantee that an aircraft will be available within a set callout window, commonly 8–24 hours, regardless of how busy the market is.

That guarantee is genuinely valuable to a specific kind of flyer: someone who flies often enough that unpredictable last-minute availability is a real business cost, and for whom certainty is worth paying a premium for. It is not, generally, a way to fly private more cheaply than the alternatives — the per-hour rate on most jet cards sits close to standard charter rates, and the value is entirely in the guarantee, not the price.

The maths only works if you fly enough hours to use the prepaid block before it expires (typically 12–24 months). Buy 25 hours and use 15, and the unused hours are a sunk cost — there's no discount for flying less than committed.

On-demand charter: full control, full price

On-demand charter is the most straightforward of the three: you tell a broker your route and date, they source an aircraft, you get a quote, you decide. No prepayment, no ongoing relationship required, no unused hours to worry about.

The trade-off is that you pay the full rate every time, including any repositioning cost if the nearest available aircraft isn't already at your departure airport — see our full charter cost breakdown for what that typically adds to a quote. There's no discount mechanism built into on-demand charter at all; the price reflects genuine market rate for a bespoke booking.

This is the right model for anyone who flies privately occasionally, needs a specific date they can't move, and doesn't fly enough hours a year to make a jet card's guarantee worth the prepayment.

Where empty legs fit — and where they genuinely don't

Empty legs sit at the opposite end of the spectrum from a jet card: zero commitment, zero prepayment, and the steepest discount of the three — commonly 25–75% below the equivalent on-demand charter rate, because you're buying a flight the aircraft was making anyway rather than commissioning a bespoke one.

The honest limitation is choice. You're matched to whatever route and date is repositioning, not one built around your plans. That makes empty legs the right fit for flexible travel — a second home, a recurring event, a trip where the destination matters more than the exact date — and the wrong fit for anything that has to happen on a specific day.

Where the three models genuinely overlap: a frequent flyer with a jet card sometimes still checks empty legs for genuinely flexible trips, since the guarantee a jet card provides isn't needed when the date was never fixed to begin with. The models aren't mutually exclusive so much as suited to different trips within the same person's travel pattern.

Side by side: cost, commitment and flexibility

Read the table by working from the right column: if your date genuinely can't move, empty legs are off the table regardless of the discount, and the choice narrows to jet card versus on-demand charter based purely on how many hours a year you fly.

A worked comparison — the same flyer, three ways

Take a hypothetical flyer who takes eight private trips a year, mostly London to European destinations, with about half their dates able to flex by a few days either way.

• All eight trips on a jet card: a card sized for that usage might run to a significant six-figure prepayment for the year's flying, locked in at standard rates with guaranteed availability on every trip — including the four with fixed dates that genuinely need it.
• All eight trips on-demand: no prepayment, but every trip at full charter rate, including the four flexible ones that could have been booked cheaper another way. Total spend is lower than the jet card only if availability isn't an issue on the fixed-date trips.
• A mixed approach — empty legs for the flexible four, on-demand for the fixed four: the flexible trips land at 25–75% below charter rate, the fixed trips cost full rate as they would either way. This combination typically comes out lowest on total annual spend, for a flyer whose dates genuinely do flex on roughly half their trips.

The jet card only wins this specific comparison if guaranteed availability has real value beyond the fixed-date trips — for example, if last-minute changes are common, or if the flyer's actual usage is meaningfully higher than eight trips a year. The mixed approach wins for anyone whose flying pattern includes genuine flexibility on at least some of their trips, which describes most private flyers outside pure business-critical travel.

Which one is actually right for you

Cutting through the marketing, the decision comes down to two honest questions:

• How many hours will you genuinely fly this year? Under roughly 25 hours, a jet card's prepayment rarely pays for itself in guaranteed-availability value — on-demand charter or empty legs will usually serve you better, hour for hour.
• How much can your dates flex? If the answer is "not at all," empty legs are off the table and the choice is jet card versus on-demand charter based on frequency. If the answer is "quite a lot," empty legs are very likely the best value of the three, by a wide margin.

Most people flying privately for the first few times, or flying only a handful of times a year, are better served checking live empty legs and setting a route alert than committing to a membership product built for a flying pattern they don't have yet.

Before you sign a jet card contract

If the maths above points toward a jet card being right for your flying pattern, a handful of questions separate a genuinely good programme from an expensive one:

• What's the actual callout window? Guaranteed availability means little if the callout window is 72 hours — ask for the specific number in writing, not a marketing description of "fast" or "priority."
• What happens to unused hours at expiry? Some programmes allow a limited rollover or extension; many don't. This is the single biggest source of buyer's remorse with jet cards, and it's a contract term, not a grey area — get it confirmed before you pay.
• Are peak days (holidays, major events) excluded or surcharged? Many cards carry blackout dates or peak-day premiums that aren't obvious from the headline hourly rate. Ask specifically about the dates you're most likely to actually want to fly.
• Is the rate genuinely fixed, or does it float with fuel? Some programmes lock the full rate; others still apply a floating fuel surcharge on top. Confirm which you're being sold before comparing one provider's price to another's.

None of these questions are unusual or difficult for a reputable provider to answer clearly. Vague or evasive answers to any of them are worth treating as a signal, not a formality.

Common questions

Is a jet card worth it for occasional flyers?

Generally not. The value in a jet card is the guaranteed-availability commitment, which only pays for itself if you fly enough hours to justify the prepayment. Someone flying privately a handful of times a year is usually better served by on-demand charter or empty legs, without tying up capital in unused hours.

How many hours a year do you need to fly to justify a jet card?

There's no universal threshold, but as a rough guide, most flyers only see genuine value once they're using upwards of 25 hours annually — enough that the guaranteed callout window and locked rate are actually being relied on regularly, rather than paid for and left unused.

Can I use empty legs if I already have a jet card?

Yes — the two aren't mutually exclusive. A jet card covers trips where you need guaranteed availability on your own schedule; empty legs remain a genuinely cheaper option for any trip where your dates can flex, regardless of what membership you hold.

What happens to unused jet card hours?

This varies by provider, but unused hours are typically a sunk cost once the card's term expires — usually 12 to 24 months from purchase. Always confirm the expiry terms before committing, since this is where the maths of a jet card can go wrong fastest.

Is on-demand charter more expensive than a jet card?

Per hour, they're usually close — a jet card's rate is typically standard market rate, locked in, not discounted. The real cost difference isn't the hourly rate, it's the large upfront prepayment a jet card requires versus paying only for the trips you actually take with on-demand charter.

Why are empty legs cheaper than both jet cards and on-demand charter?

Because an empty leg is a flight the operator was already committed to making — repositioning an aircraft with no passengers aboard. Neither a jet card nor on-demand charter carries that built-in discount mechanism, since both are pricing a bespoke booking rather than an existing repositioning flight.

Do jet cards let me choose any aircraft I want?

Within the card's tier, yes — that guaranteed access to a specific aircraft category is a core part of what you're paying for. This is a genuine advantage over empty legs, where you're matched to whatever aircraft is already repositioning rather than one you select.

What's the minimum commitment for a jet card?

This varies significantly by provider, but meaningful jet card programmes commonly start from 25 flight hours upwards, representing a substantial prepayment. Always request the full terms, including expiry and any peak-day restrictions, before comparing one provider's card to another's.

Is there a membership option with no prepayment?

Not in the traditional jet-card sense — the prepayment is what funds the availability guarantee. What comes closest to a no-commitment equivalent is simply using on-demand charter for fixed dates and empty legs for flexible ones, without any membership product at all.

Which option has the least financial risk?

Empty legs and on-demand charter both carry no upfront commitment, so neither exposes you to the risk of unused prepaid hours. A jet card carries the most financial risk in this specific sense — the value depends entirely on flying enough to use what you've paid for.