The airport is set to undergo major work over the coming years to handle up to 40 million passengers annually, almost twice the current number.
Plans include expanding Pier B and Pier C, joining terminals together and providing more space for very large aircraft by expanding the runway system and constructing a new pier.
The project also includes construction of a station for high-speed trains to bring travellers from both Oslo and Hamburg, and changes to the arrivals area with additional large conveyors.
More space could also be developed by expanding the shopping area.
(link opens in new tab). The deadline is 27 May.
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