I'm starting to wonder whether there might not be a case for developing a really huge network of high-speed rail lines across not only Europe but Asia and Africa too. Of course it wouldn't be as fast as flying, but the stress would be a lot less: Eurostar security arrangements seem to work okay.

As an example, London to New Delhi is a little over 4,000 miles. Given TGV-standard infrastructure, that journey could be done in 36 hours or so. A huge undertaking, yes, but compared to the security (and environmental) costs of air travel?