• China's Big Three airlines forecast heavy losses for the first half of the year.
• Higher fuel costs are the main challenge, despite cost management measures.
• Air China, China Eastern, and China Southern were profitable in the first quarter.
• Net losses for the January-June period are expected to be steeper than last year.

The fuel crisis may indicate a significant challenge for China's aviation industry, which could impact the global market. The losses faced by the Big Three airlines suggest that they may need to adjust their strategies to mitigate the effects of higher fuel costs, which could lead to changes in the competitive landscape.