The International Air Transport Association (IATA) recently revised down its outlook for the global airline industry, but the performance this year has nevertheless been much better than in 2012. The bottom lines of airlines around the world are improving, even if the pace of improvement slowed during the second quarter of the year.

IATA now expects global airline industry profits this year to come in at $11.7 billion on revenues of $708 billion. In June, the Montreal-based organization had predicted profits for the year to be $12.7 billion. Despite the revision, the performance this year is much better than in 2012, when airline profits were $7.4 billion.

"The story is largely positive. Profitability continues on an improving trajectory," said IATA's director general and CEO Tony Tyler, the former chief executive at Cathay Pacific. "But we have run into a few speed bumps. Cargo growth has not materialized. Emerging markets have slowed. And the oil price spike has had a dampening effect."

Most of the growth is expected to come out of airlines in North America and Europe. Airlines in North America are expected to double their 2012 profits to $4.9 billion. Airlines in Europe are expected to book record profits of $1.7 billion.

IATA's most visible downgrades are among Asia-Pacific airlines. IATA downgraded its profit expectations for airlines in the region by $1.5 billion to $3.1 billion because of slower growth in emerging economies and their significant exposure to the cargo business, which has been hit by the flat growth.

While the one highlight in the region has been the strengthening of the domestic market in China, the biggest airlines in the country are finding it difficult to keep pace with their global peers.

The country's three big airlines — China Southern, China Eastern and Air China — are struggling with a difficult environment. Economic growth in China has slowed (although it now appears to be once again gaining some ground) and the price of oil has jumped over the past few months.

China Southern carried 9.13 million passengers in August, a 10.2 percent jump over the same month a year earlier. Between January and August, the airline carried 61.5 million passengers, up 6.7 percent over a year earlier. Air China recorded turnover of 46 billion yuan in the first half of 2013, down 2 percent from 2012. Passenger revenue dropped 1.68 percent and cargo revenue fell 2.93 percent. Operating expenses rose almost 1 percent.

All told, operating profits dropped 49 percent to 1.43 billion yuan during the first six months of the year, but net profits rose 9.9 percent thanks to currency appreciation. The airline carried 37.45 million passengers in the first half of the year, an increase of 7.78 percent.

China Eastern saw a 23 percent drop in net profits to 763 million yuan because of weaker domestic demand, although it made some gains from currency exchanges. But the struggling airlines are holding on to expectations of a bright future as outbound tourism becomes commonplace and air travel more accessible. Already, about 5 percent of the population is likely to travel abroad, according to COTRI. That's about 70 million potential customers, more people than there are in France or the United Kingdom.

Last year, China's tourism revenue hit 2.57 trillion yuan, up 14 percent from 2011. About 132 million inbound tourists generated $50 billion in revenue, about the same as they did in 2011.

A significant change this year, according to COTRI, is that China's new leadership is encouraging outbound tourism for the first time. As a result, outbound tourism is growing fast. The 83 million border crossings out of China last year represented an 18 percent hike from 2011. And growth is likely to continue. Chinese tourists spent $102 billion abroad in 2012, which makes them the biggest tourism spenders in the world. This year, they could spend around $110 billion.