I have two questions related to making changes to a DONE5 currently in progress. If these have appeared elsewhere, please accept my apologies and direct me to the appropriate threads (a fast search turned up nothing).

1) With two people traveling together on the same booking, can one of us fly seperately on one of the intercontinental segments? I mean, make a change to that particular person's booking but not the other person?

2) The (possible) changes will be made in Seattle. Would anyone recommend if it is better to call or go to AA, or go to the BA ticketing desk at SEA? Or would it be even better to call the person who originally issued the tickets? (The agent was in the Netherlands, DONE5 is ex-JNB).

Thanks for any and all advice!