I recently bought (full paid) a flight ticket with Air France (from their official site) and I got my confirmation code (6 letters and digits).
Normally I use checkmytrip.com to check my flight details and save the page as PDF.
However this reservation is not available on checkmytrip (I get the message
The system is unable to retrieve this trip) or alternative sites like the one I found in this question
Is Air France that uses a different booking system or there is another reason why I can't check my flight?