It would appear we all have to go in and fix all these issues are selves or wait who knows how long for ND to update.... it gets quite time consuming to have to go in and make all kinds of changes like this.
I would like to show what I found right away tho... In looking into PHL the
CLT, PHL, 319, AA, 869P, 20:43, 12:00, 1, AA
is actually what would appear a duplicate as well as I also found this further down
CLT, PHL, 319, AA, 869, 19:39, 12:00, 1, AA
as you can see the two are identical minus the slight difference in time... maybe the schedule changed...thus changing the time and instead of changing the time for that flight they made they change as a new entry but forgot to remove the old one?
I only just started to go though PHL so thats all I have found so far at least
cheers,
Dev