"Our priority is to ensure our customers go on their holidays and we are, therefore, putting contingency plans in place including using alternative aircraft for our long-haul flights to Mexico and Florida if delivery is delayed beyond the end of March, " Thomson said in a statement.

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It develops natural gas engines for virtually every transportation sector from forklifts, delivery vans, and buses to long-haul trucks, railroad locomotives, and mine haul trucks.

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Hunt have come to see the advantage of putting trailers on flat wagons for long-haul and using roads only for local pickup and delivery.

ECONOMIST: American railways

Whilst much of the attention surrounding scramjets has focussed on the shorter journey times they could bring to long-haul passenger air travel, the first applications are likely to be in the space delivery business - launching small payloads, such as communications satellites, into orbit.

BBC: Experimental jet 'a success'