Originally Posted by
exerda
To be fair, with self-reporting from FTers, there's going to be a selection bias present in the data regardless of how large the data set is--unless as you say it covered all pax and flights.
The same bias is, of course, present here in FT reporting in this thread...
UDU stats and now did it clear at least capture the information in a somewhat organized fashion.
But yes, any self reporting system will have bias.