KLM1267 data quality problem

FlightAware AeroAPI
1

I was analysing the data quality of “AirportBoards”, based on AMS on 21-Dec, 11am:

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There are hundreds of flights with “result unknown”, including for example KLM1267.

Looking for KLM1267 in the public part of flightaware.com:

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The short flight time seems to indicate a data problem.

Any particular reasons for this problem that you can think of?

2

I’m seeing the same with other KLM flights too (eg KL1116 on Dec 27), which appear in the XML as cancelled, but if viewed on the web they have a short flight time.