This is great stuff!
After having read this forum for quite a while now, I dare to ask my own question:
I have some upcoming IC flights and I am wondering which carrier to contact in regard to registering my, soon to be expired SK*G, for status and my new A3 for earning.
I am able to see all reservations at both CO and UA websites, but not on SK (a lot of things can be said about their website..). Should I contact the carrier operating the first leg of each flight, or could a rep at UA or CO do all at once?
(All flights booked at SK-subsidiary Wideroe to complicate things

)
Flights:
1: OSL-CPH-ORD-IAH (Metal: SK, SK, UA)
2: IAH-EWR-OSL (Metal: CO, CO)
3: OSL-EWR-IAH (Metal: SK, CO)
4: IAH-EWR-OSL (Metal: CO, SK)
Help is very much appreciated!