This weekend's BA cabin crew strike will have mixed consequences for UK business travellers.
One travel management company (TMC) calculated that some 420 of its clients' travellers could be affected by the stoppage.
But another leading agency said the strike was "not causing chaos" and was "manageable" as it was taking place over a Saturday, Sunday and Monday.
Adam Knights, group sales director for ATPI, an oil and marine travel specialist, said the agency had used "sophisticated pre-trip database" to identify affected passengers.
He added: "Where an engineer, ship's crew or driller has to be at a particular location at a particular time, it's vital for us to be able to react quickly when anything impacts those travel plans.
"In this case being able to tell clients what's going and what's not, means they can rebook on alternative operating BA flights or other carriers whilst seats are still available."
Anthony Rissbrook, managing director of Co-operative Travel Management, told ABTN his TMC was "not getting a lot of cancellations" on flights over the strike period.
"Most will try and fly with BA if they have a booking. There were a lot of questions when the strike was first announced but clients are now reasonably comfortable that BA can get them on their flight."
The airline has said that it aims to fly 65% of its customers during the walk out by cabin crew members of the Unite union.
The airline had also claimed that "larger volumes" of cabin crew had called in to offer to work during the strike. It said the number had "increased significantly" since Monday.
It also claimed the support of more than 60 other airlines which have offered charters or spare seats.
But there were signs today (March 18) that the BA strike, over working conditions for cabin crew, could have global affects.
Cabin crew at Air France said they would come out on a three-day strike from March 28 - BA staff are due to start a second, four-day strike on March 27 - while Unite has also had pledges of support from airport staff in the US and Germany.
Steve Turner, a senior Unite official, is in the US to meet executives from the Teamsters union about what actions its members could take against BA flights.
The International Transport Workers Federation has also backed the BA cabin crew.
"Our member unions will continue to mobilise to support the strikers, using the kind of lawful expressions of solidarity that are most appropriate to them," said Gabriel Mocho, the group's aviation secretary.
"That means whatever expression of solidarity they feel is within their power and within the laws of the land where they are located."
Unite also called on Lord Adonis, the UK transport secretary, to investigate "British Airways' plans to deploy a strike-breaking crew."
It said the minister "must take all steps to ensure that the reputation of UK aviation is not damaged by BA's determination to deploy under-trained novices as cabin crew during the strikes which loom this weekend."
Willie Walsh, BA's ceo, went to the TUC headquarters last night, but BA declined to comment on the meeting.
Earlier Mr Walsh said: "The determination of our colleagues across the whole business to keep the flag flying this weekend is increasing.
"I am delighted by the numbers of cabin crew who have been getting in touch with us to express their disillusion with Unite's position.
"Our crews just want to work as normal, do their usual terrific job and look after our customers.
"We will now have the potential to fly more than 4,000 additional customers per day and serve more destinations.
"We believe this is a helpful move at a time when customers are facing rising fares with alternative carriers."
The airline has also refused to say that it will not sack senior shops stewards from Bassa, the cabin crew's union and part of the bigger Unite grouping, who have been involved in calling the strike.
Seven Bassa committee members already face disciplinary action by the airline.