The US airline industry is enjoying a nearly unprecedented stretch of success, with 2015 profits nearly triple those of 2014. Low fuel prices and relatively strong demand indicate that 2016 will show similar results. The share of Americans taking to the skies has remained unchanged for the past five years, even as passenger counts hit new record highs. This means that a smaller, select group of travelers are flying with greater frequency. Despite industry consolidation, competition for these frequent flyers continues to heat up as major carriers develop new services and restructure loyalty programs to benefit these top-tier flyers.