As flights remain grounded, business travellers are trying anything to get home, according to travel management companies (TMCs).
TMCs with clients stranded abroad are trying alternative routes to get them home, on crowded ferries or heavily booked eurostar trains.
HRG said one set of travellers had clubbed together to buy a car in Spain, and then driven to the UK via a cross-channel ferry.
Another HRG client had to buy a bicycle in France to be allowed home, as the ferry was not allowing foot passengers.
Ian Windsor, managing director of HRG, UK, said: "He had a laptop bag and a trolley bag and was forced to ride the bike onto the ferry. He then had to stand with it for the full journey, and then ride it off at the other end. Then he was getting a coach into central London, and had to leave the bike behind."
Another HRG client was stuck in Stockholm. He got the ferry to Malmo, then another ferry to Copenhagen, before catching a train to Essburg, and then onto Paris.
"I think there is an element of the Dunkirk spirit... Business travellers are remarkably resolute people," said Windsor, but, he added, "there is frustration - it's been five days now, people are saying it's getting silly."
Wayne Pollard, director of sales at Midas Travel, said: "We know who's stuck - it's in the hundreds. To a certain extent, it's about putting out fires. We're looking at every option to get them back. Road, rail, air, sea... we're looking at absolutely everything.
"One client is trying to get home from Tokyo. He has travelled from Tokyo to Vancouver, then today hopefully he will fly from Vancouver to New York. From New York he can fly to Barcelona and then travel by rail through Europe to try to get somewhere near the coast. The biggest issue is that he had to update his ESTA details [which usually takes several days]."
Another Midas Travel client travelling from Beijing to London has had to go via New York to Madrid, then on ground transport from Madrid to Normandy.
Midas is warning against making future travel plans for next week. "The message we're giving to clients is unless it's extraordinary circumstances, it's best not to organise any business travel until the coming weeks."
TMCs have extended office working hours in an effort to help stranded passengers, with senior management staff at Capita, HRG and Midas working on the phones over the weekend.
CWT has also extended its office working hours, and is sending a coach over to Paris today, to pick up stranded travellers.