They argue that governments can protect themselves privately against sudden flights of capital.
Virgin also plans to start its own flights to the capital in 2013.
Passengers reporting at the airport on Wednesday were transferred to Islamabad, the Pakistani capital, to catch their flights from there.
Zimbabwe also promotes tourism from China and twice-weekly direct flights from its capital, Harare, to Beijing, are about to take off.
ECONOMIST: Booming Chinese interest in Africa is not just about oil
The accident has raised the issue of how to ensure helicopter flights over the capital are safe, particularly as high-rise developments mushroom near the Thames.
Prime Minister David Cameron responded that the question of flights over the capital "is inevitably something that has to be carefully looked at" in light of the crash.
Several domestic and international flights to the Indian capital have been diverted to Bombay.
On July 16th flydubai, a low-cost airline based in the United Arab Emirates (UAE), launched no-frills flights to Erbil, capital of Iraq's Kurdish region.
The airport, located about 10 miles outside the city, intends to use the money from drilling to lower costs to airlines in hopes of attracting more flights, and for capital improvements.
From Europe there are only a few flights a week to the capital city of Kigali.
Dense fog in the capital Delhi has brought delays to many flights and railway journeys, and caused a spate of road accidents.
The twice-daily flights will operate between the Scottish capital and London Oxford Airport from 4 March.
The ash cloud is now so big that airlines have been cancelling flights in and out of the capital, Jakarta, 450km (280 miles) to the north-west.
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The U.S. Air Force is keeping between eight and 10 people at the airport in Mali's capital to help with the incoming and outgoing flights, the Pentagon said late Tuesday.
The airport in the capital of Pago Pago was also operational and being used for emergency flights, FEMA said.
CNN: Scores dead, villages flattened in devastating Samoan tsunami
"The visibility at Beijing Capital International Airport at one point fell to five to 10 metres, delaying some flights, " Xinhua news agency reports.
Silicon Valley is now the world's most economically active place (surpassing a rueful Asia in mid-'97), and international flights into San Francisco and San Jose, the valley's "capital, " dump foreign deal-makers at record levels.
CNN: ASIANOW - TIME Asia | Asia Buzz: It Still Isn't Very There Here
In March, Brighton City Airways (BCA) launched flights from Brighton (Shoreham) Airport to Paris Pontoise, near the French capital.
Peach and Air Asia Japan have their sights not only on domestic flights but also on the route between Tokyo and Seoul, the nearest foreign capital.
It also secured the rights to host tourism and scientific research space flights and said it planned to build a spaceport in Abu Dhabi, the capital of the seven-member United Arab Emirates federation.
The flights revealed by Mr Darling included one stopover on the way between the Afghan capital Kabul and Washington and others stopping on their way to destinations in the Middle East such as Amman in Jordan and Riyadh in Saudi Arabia.
BBC: NEWS | UK | UK Politics | 'Rendition flights' landed in UK
By early Monday, with more than 9 inches of snow reported in some areas of Denver, airline operations in the Colorado capital were working to return to normal a day after more than 200 of 1, 500 flights had been canceled and hundreds more flights were delayed because of the weather, according to the Federal Aviation Administration.
Airlines in the Colorado capital were working to return to normal operations a day after more than 200 of 1, 500 flights had been canceled and hundreds more flights were delayed because of the weather, according to the Federal Aviation Administration.
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