An aviation research firm says added flights and demand has increased airline capacity by six percent in December.

The firm, OAG reports global economic improvement is helping to boost travel demand in all regions of the world except North and South America.

The research also shows capacity on flights to and from the Middle East, Asia, Africa and Europe all rose between 11 percent and 13 percent over December 2009.

Airlines boost capacity by adding flights or using larger planes that carry more passengers. 

Between 2008 and 2009, a number of airlines reduced flights when record-high fuel prices and a recession hit the industry. 

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