Six ideas that were seen as having the most potential included: alternative propulsion, a cruiser/feeder type of long range transport, ground-assisted take-off and landing, personal air travel, advanced airport systems and global air traffic systems.

The first four of these ideas now feature in the latest €80.42 million seven-year research agenda.

Visual stealth

The Cruiser/Feeder concept including mid-air refuelling

The concept envisages very large - possibly nuclear-powered - aircraft flying on stable circuitous routes that connect major centres of population. These large cruisers remain airborne for very long periods so that they could be considered to be permanently cycling around t

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