Many thanks to everyone for all the comments above! Very helpful!

I've managed to verify my trip using Travelsky, but can't manage to check my itinerary...

I booked via Priceline and it's been issued by Air China. The route is AMS-FRA-PEK-HKG, returning PVG-PEK-MUN-AMS. Respective airlines: KL-CA-CA, returning CA-CA-LH. I've received the eticket numbers, a KLM/LH reservation number (PNR) and a Air China reservation number (PNR)

For verification (on the Travelsky homepage) I succeeded by using the eticket numbers and LASTNAME/FIRSTNAMEMR.

However for checking the itinerary (http://www.travelsky.com/newsky/journey_online.jsp) I have not managed. I understand I have to use the Air China PNR (not the eticket number or KLM/LH PNR) and a similar name combination? I've tried literally every imaginable comnination of first and last name, reversed, with spaces or slashes, with or without titles, and every variation of capitals and lower case... but no luck!! What is the way to do it?

Interestingly enough I've managed to verify the booking via checkmytrip (using the KLM/LH PNR), but the flight from Shanghai to Beijing is missing... does anyone know why?

I'd be very happy if anyone can share their thoughts on these two questions! Thanks!