Among the major U.S. airlines, Delta has long had the best economy class product. In fact, their major competitors, United and American, really aren’t close at this point.
However, in the premium cabin market, things aren’t as clear cut, and competition has been heating up lately. One key item to note up front is that while the name Delta One sounds like a name for a first-class product, Delta One is actually a business class product. This applies to both the transcontinental and international versions. Therefore, when making comparisons to other premium cabin products, business class is the proper benchmark.