Wolfgang Mayrhuber, ceo of Lufthansa, became the latest European airline chief to criticise the plans of Delta Air Lines to expand its transatlantic routes.
Mr Mayrhuber, speaking at a press briefing at the Star Alliance meeting in Montreal, said he disapproved of what Delta which is in Chapter 11 bankruptcy protection was doing.
"If you are in bankruptcy, why should you be able to do this with creditors' money. Why are capital costs not applicable to them?
"You should only run an airline if it is cash positive.
"If the US-EU are drawing up standards, this should be one of the issues that should be sorted out."
Willie Walsh, BA's ceo, had similarly criticised Delta in October for its expansion plans while in Chapter 11.
Mr Mayrhuber also condemned the US for its strict rules on foreign ownership of airlines. "If you are going to have an open market from California to Russia, it should be by the same rules.
"America was the country that fertilised global financing. They did it around the world. If you believe in free trade, why are they so worried about this industry?
"We would not invest in the American aviation industry as the risk is too high but it is the principle that I am talking about.
"I would like a vision statement from them. If they want to have an open market, let's hear it from them," he said.
Air Canada passes a hit with business travel
A range of air passes introduced by Air Canada is proving popular with business travellers, Montie Brewer, the carrier's ceo, told a Star Alliance press briefing in Montreal.
The passes offer discount in return for bulk buying. Already in the market were passes for ten or 20 flights and passes aimed specifically at oil workers in Alberta, Canada.
Mr Brewer said there were also plans to extend the scheme by bringing in unlimited passes for a
Canadian $7,000 a month (£3,500).
A spokesman for the airline said the passes would not be a replacement for traditional corporate deals.