Having only used Cage for Jetblue and United I can't say how she would work for other airlines.
She focuses heavy on the HR side of things . Which in many cases people desperately need , how to explain something in your past , failed rides , job gaps in history etc . Even things people thing they can explain easily ended up shooting them sleeves in the foot .
However from what I gather , Emerald Coast is whom I have always heard are the people to use for Fedex and Delta , they focus not only on the above but also on the technical side which I don't believe Cage Consulting does . (Could be wrong)
Just something to consider, not all prep services do the same thing .
She is great from personal experience, however in both Jetblue and United they focus a bit more on TMAAT stories more than the tech stuff that Delta/Fedex does .
Good luck