Works well to "remember" such data to complete ADS-B records.
Now I found out that it works a little too well - especially when it remembers the last flightnumber from hours ago. And...it takes quite a few ADS-B blips to update the current flight number.
What's the impact? You can see it below.... I record 2..3 blips with the old flight number EWG16U from 13:43 when the current flight at 17:29 is now EWG95U.