Spirit Airlines got a higher percentage of revenue, 38.4%, from ancillary services in 2013 than did any of the other 58 airlines around the world that disclosed their revenue from such fees and services.
But, in terms of actual dollars generated, 10 airlines made the billion dollar club in 2013, generating at least that amount in ancillary revenue.
United Airlines was the overall leader in ancillary revenue ($5.7 billion), followed by the combined American and US Airways ($3.18 billion) and Delta (2.52 billion).
via The 10 Airlines in the $1 Billion Ancillary Fee Club – Skift.