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The Economics of Incremental Weight

What does one extra kilogram really cost an airline?

A practical research paper for airline commercial, ancillary, network and operations teams.

February 10, 2026RESEARCH PAPER

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The Economics of Incremental Weight
FORTHCODE RESEARCH

What does one extra kilogram really cost an airline?

A practical research paper for airline commercial, ancillary, network and operations teams.

NARROW-BODY ECONOMICS
AVERAGE ALLOCATED COST
$0.24 - $0.31
per kg / 1,000 km

Useful for route accounting and allocating the total mission fuel bill across payload.

INCREMENTAL COST
$0.032 - $0.037
per additional kg / 1,000 km

Useful for deciding whether an additional item, bag, catering load or product is worth carrying.

WORKED EXAMPLE

A 250 g onboard product on a 1,500 km sector

Extra item weight250 g
Sector distance1,500 km
Estimated incremental fuel cost$0.012
Full research paperIncludes methodology & benchmarks
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