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The flight data on ftdashboard.net has been put together from various sources, including ADS-B, ACARS and airport timeliness statistics.
Data quality issues
When viewing a particular aircraft, a departure from LHR (or HEL) from destination X should always be followed by an arrival from the same destination. Due to missing data, this is not always the case.
For flights departing or arriving close to midnight, identifying the correct date is a challenge. This is more of an issue with AY and HEL, not so much with BA and LHR where very little is scheduled between 23:00 and 04:00.