Originally Posted by
ExpertFlyer Voice
ExpertFlyer does not used cached data. We retrieve the data from the airline reservation systems when you request it.
That is correct, once the flight goes under airport control the reservation system availability may not be updated by the airline in real time anymore, if at all.
EF may not be doing the caching, but that seems like a confirmation that the data accessed by EF may, in some cases, be old/cached/out of date.