Avoid bargain, restricted or promotional airline tickets, particularly if they involve indirect flights. The inherent limitations, such as penalties for changes and amendments and not being able to switch to other airlines, will be untenable. Those flight connections that have been feasible, but tight, will no longer be possible, says the Institute of Travel Management (www.itm.org.uk). Anything less than two hours can be considered risky. Business travellers will be far better holding a fully flexible, and, therefore, more expensive, ticket in their hand. "It is a difficult situation," says Paul Allan, chairman of Shepperton-based business travel house Ian Allan Travel. "Flexible tickets can be altered for the return flight, whereas business travellers who downgrade to low-cost airlines or cheaper, restricted tickets won't be able to do that. And even if they stick to scheduled mainline carriers, fewer flights will limit choice."