I have an ExpertFlyer alert on for TAM LHR-GRU D class on 24th July. No e-mail from them for over 17 hours, but when I randomly called United Reservations to check on this for me, they said that they can confirm me on LHR-GRU D class on TAM.

When I told United that this is conflicting with my source (ExpertFlyer), the CSR said that it just opened. Which I find difficult to believe (a random opening while EF still says D0)

Does Expertflyer show all revenue inventory fare bucket availability? What could be the explanation?