Over the past couple of years, airlines and credit card companies like American, United, Chase and Capital One are investing millions into expanding their airport lounge networks for customers. According to Chase, lounge access is often the top cited reason for its credit card signups, and by the end of 2023, Delta said it would add 2,700 seats to its lounges. However, lounges have become so popular that some face overcrowding, and companies like Delta are making it harder to get airline status.