Airfares hit a six-year low

CBS NEWS -- Planes packed with summer travelers should be a sign of success for airlines, but new data shows the average domestic airfare for the first part of 2016 dropped nearly eight percent over last year. That's the lowest point since 2010.Ultra-low fare carriers like Spirit, Frontier, and Allegiant have grown aggressively. They've expanded capacity just as terror attacks in Europe, economic uncertainty in Britain, a strong dollar, and increased competition are cutting into lucrative routes