Across the country, specialfares were on offer in operation on public transport, exhibitions will show the effect of pollution on people and buildings, and new non-polluting types of transport will be on display.
For example, Travelocity has now introduced a service that allows the user to check out the availability of specialfares on any route -- within North America or international -- on the days those discounts are offered by specific carriers.
As in America, where low-cost Southwest Airlines announced special cheap fares this week, the no-frills Europeans led by Ryanair and easyJet have slashed prices in response to a 25% fall in bookings after the attack.