In addition to NYC metro, B6 (JetBlue) has a large operation at IAD. All day today, IAD was struggling to keep one runway open for incoming international flights...and that was it. While your aircraft may have been doing a MCO-EWR-MCO run, you just don't know where else it was heading. It isn't doing that roundtrip all day...if it was scheduled to pass through IAD, which there is a decent chance it was...then that is your problem. For instance, if it was a scheduled LGB-IAD-MCO-EWR-MCO-LGB (which would be a typical utilization for B6), then...everybody on the MCO-EWR, EWR-MCO and MCO-LGB lets are out of luck. In the case of that last leg, we're talking about two totally unaffected airports--but still a cancelled flight because it never left LGB or IAD.