Shares of American Airlines (NASDAQ: AAL) were up more than 1% in premarket trading Friday, following a positive Q1 earnings announcement, according to Reuters. Sales almost doubled from a year ago, rising to $932 million. According to American Airlines, the strong U.S. dollar played a part in revenues dipping 1.7%, Reuters reported, eventually settling at $9.8 billion. However, world’s largest passenger airline carrier was able to cut costs this quarter significantly due to the low prices of oil worldwide. Reuters reported the carrier spent more than 40% less on fuel than the year prior. "All of this puts us on a great track to finish the heavy lift remaining in 2015, including the large task of combining our passenger service systems," Chief Executive Officer Doug Parker told employees in a letter, according to Reuters.