Exceptionally useful and very good addition. I know it is in the beta phase, but in case it helps. For daily flights that take off on one date and land the next day, it seems to be consistently picking the registration of the plane from landing that morning from yesterday not departing day so reg seems to be a day out.

ie. If you have a flight on 2nd March (landing early hours of 3rd March) - it populates the registration from that flight number that landed earlier on 2nd march (that took off 1st march) - Effectively grabs yesterdays flight as it landed earlier on the date that it departs.