Transport experts say the global airline industry relies heavily on passenger rail and air freight services, with little attention paid to the role that air transport plays in the transportation of goods and services.

In the past two years, the International Air Transport Association (IATA) has seen a steady increase in the number of passenger rail passenger trains, and a doubling in the size of passenger-carrying aircraft, which are used to transport freight. 

IATA has estimated that passenger rail could add more than $1 trillion to the global economy by 2050, and the industry is looking at the opportunities of new routes, especially in China.

The airlines that have been the most successful have been China Airlines, which has expanded to serve the Beijing-Tianjin-Tibet area and Hong Kong-Macau, and Lufthansa.

It is also looking at expanding its footprint beyond its core base of destinations to include Hong Kong, Singapore, Singapore and the US. 

 But many of the airline routes are run by foreign carriers, such as United and British Airways, which have been trying to tap into a growing market of travellers from Asia.

In fact, the IATA says that in the past five years, it has seen the rise of over 10 million domestic passengers, mainly from Asia, who are increasingly choosing to travel on international routes. 

“We are seeing a shift in how international travel is being conducted,” said Steve Smith, president of the IAA’s transportation division.

“We’ve seen the increase in passenger rail services to China and other countries.

We’ve seen that increase as well, and we’ve seen a lot of people traveling to the United States.” 

 Smith said airlines were looking at both ways to attract new customers, including by offering cheaper fares and offering discounts on flights.

“We’re seeing some of the airlines in China that are looking at using air travel to get people into their markets and we’re seeing a lot more of the carriers looking at domestic flight services,” Smith said.

“There’s been a huge surge in the amount of domestic flights that have gone into Asia over the last couple of years.”

 While the airline industry’s focus has been on expanding air travel, it is also beginning to pay attention to the impact of air travel on the environment.

In December, the US Department of Transportation issued a new directive, which would require airlines to consider the environmental impact of flights.

The directive also said that if an airline is going to add a new route, it must include all the environmental benefits and costs of the project.

The IATA also says that, as a result of its research, the airline and the government are working together to identify additional routes to take advantage of the global economic growth.

But aviation experts say that the industry could be on the road to bankruptcy if it continues to take in the money that is needed to operate. 

One example is the Trans-Pacific Partnership (TPP), which was negotiated by the United Kingdom and other Pacific Rim countries.

The agreement was aimed at creating a free-trade area that would allow for greater trade between the United Nations, the European Union and the United Arab Emirates.

As part of the agreement, the United Sates and other governments would have to allow the airlines to fly to and from the United nations, and in return would receive certain benefits.

According to an analysis by the aviation consultancy firm IHS, the agreement would give airlines an estimated $1.4 trillion in revenue and boost their global profits by up to $50 billion a year.

The IATA estimates that the economic impact of the TPP would be around $300 billion a decade, and could lead to a loss of at least $6 billion in annual revenue for airlines.

One of the reasons airlines are not willing to take on the risks is because of the political and regulatory barriers that exist, according to Tom Krawczyk, an aerospace analyst with Bloomberg Intelligence.

In order to increase the size and scope of the business, airlines will have to compete in more countries and face less regulation.

It will also have to be able to take greater risks to stay competitive, said Kraws, adding that, if the business does not grow, the industry will face economic and financial challenges.

Kraws said that while the industry has grown, the business has become more focused on expanding to new markets.

 “The carriers have been working on expanding their business and trying to diversify, but in the end, it’s a race to the bottom,” Kraw said.