Delta has never had set prices and this is fake outrage. Airlines have used algorithms since deregulation in the 70s to set prices. The “algorithm” use to be simpler based on “fair classes”. A fair class is not a simple - Main, C+ and FC. Two people sitting in main can have different fair classes.
Of course as computers have gotten more sophisticated, the machine learning/revenue optimization rules have too.
For instance it costs less for me to fly Delta from MCO (Orlando) -> ATL -> SJO (San Jose Costa Rica) than it does our friends to fly from ATL -> SJO when we are both flying the same second leg.
There are other tricks to like booking a Delta flight via AirFrance or Virgin Airlines domestically cheaper.
https://www.alternativeairlines.com/fare-basis-codes-explain...
Of course as computers have gotten more sophisticated, the machine learning/revenue optimization rules have too.
For instance it costs less for me to fly Delta from MCO (Orlando) -> ATL -> SJO (San Jose Costa Rica) than it does our friends to fly from ATL -> SJO when we are both flying the same second leg.
There are other tricks to like booking a Delta flight via AirFrance or Virgin Airlines domestically cheaper.