The rise of budget flights over the last few decades has made travelling abroad accessible to millions. But which companies are offering the best service? The 2017 Skytrax World Airline Awards have been announced, revealing the top 20 low-cost airlines. Results are determined by the world’s largest annual passenger satisfaction survey, which requires customers to rate 49 aspects of their travel experience, including check-in, the cabin service and on board products. Here’s the countdown…