JetBlue Airways Corp. Wednesday reported that traffic and capacity both grew in July.

Traffic increased 8.9% from the year-earlier period as capacity grew 10.4%. However, load factor, or the percentage of seats filled, fell 1.3 points to 87%. Passenger revenue per available seat mile--a key industry metric--grew about 1%.

Airline executives have repeatedly said in recent months that they would limit capacity growth to protect profit margins. Those statements came in response to broad declines in airline stocks, sparked by investor fears that cheap fuel would prompt carriers to oversupply the market.

Shares of JetBlue have increased about 46% this year through Tuesday's close.

Write to Angela Chen at angela.chen@wsj.com

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