The below charts were built from 60,000+ reviews scraped from www.airlinequality.com. I used a threshold of >150 reviews for each metric to remove some of the lesser-reviewed airlines.
20 worst airlines
20 best airlines
The worst month to fly in terms of airline satisfaction is July
Cabin staff rating is most closely correlated to a high overall rating, while in-flight entertainment is least likely to impact an airlines overall score
Business class passengers gave their cabin staff the highest ratings, while premium economy came in lowest
Below is a complete list of the full-service airlines included in this analysis, along with their average overall rating. Keep in mind that some of these had a very small (<150) sample size, and were stripped from the above metrics.