All tickets that are included in your statement in a calendar year will be taken into account for your turnover irrespective of the issue date and flight date of the ticket. The turnover is calculated based on the ticket fare and carrier surcharge stated on your ticket. The carrier surcharge is stated as the YR charge. The YR-F charge is excluded from the bluebiz earning scheme. This is the same turnover on which your blue credits are calculated. See also our incentive scheme here. Tickets which are not eligible within the bluebiz programme will not be taken into account for the turnover. Until the moment the threshold is reached all the tickets in your account will be shown without blue credits.
The calculation is not based on your flight date or issuance date, but on the date that the ticket is added to your account overview.