3.
Irrespective of its extent, a price increase shall be possible only if the organiser notifies the traveller clearly and comprehensibly of it with a justification for that increase and a calculation, on a durable medium at the latest 20 days before the start of the package.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-11 · Text as adopted (Official Journal); later amendments are not incorporated in this text.