Why two quotes for the 'same' flight differ by thousands.

Two quotes aren't comparable just because they name the same airports and the same passenger count. They can use different aircraft, different carriers, different home bases, different fuel assumptions, and fee structures that don't line up.

Variables that move the total

• Base and positioning cost.
• Aircraft type, configuration, and available payload.
• Tail number and real availability.
• Minimum billable hours.
• Crew duty, overnight, and transport.
• Landing, handling, parking, and slots.
• Permits, customs, and overflight.
• Catering, ground transportation, and security.
• Federal Excise Tax and other taxes.
• Brokerage fee or margin.

NBAA recommends an apples-to-apples comparison that includes one-way fees, fuel surcharges, wait time, crew transportation, overnight, catering, ground transport, overflight, landing, handling, customs, immigration, security, and FET.

The hidden variable: availability

One quote can be built around an aircraft that's only tentatively available, while another uses an aircraft that's already confirmed. The first can be cheaper because it hasn't priced in the cost of actually securing that tail number — or because the operator can still swap it out.

There can also be a mission-fit gap. A jet with a lower hourly rate might need a stop, carry less baggage, or depart from an alternate airport. The correct total includes the cost, and the lost utility, of that difference.

How to compare

Build a sheet with identical columns:

A difference of thousands can be reasonable if the second quote buys an aircraft that's already secured, a better operational route, or lower substitution risk. It isn't reasonable if the provider can't explain what assumptions sit behind the total.