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Given a travel related situation, and given a specific question about the situation, summarize the question into a title

I am a frequent traveller with Etihad program, so I have miles there. Alitalia is in the Etihad Airways Partners program, so whenever I fly with Alitalia I still save my miles on the Etihad program.

Next month I have a flight with Aeroflot: looking at their loyalty program, they are in SkyTeam, which involves also Alitalia within the partnership.

How is it possible that flying with Alitalia I can be in two different loyalty programs?

Will I be able to use the miles with Etihad program?

Should I join the SkyTeam Alliance (but I didn't understand which of the "sub-alliances" I should apply for)?

How can I earn miles from these flights and enjoy them?

I am also in the Miles&More frequent traveller program, but I think for this flight it is useless.

Output:
Frequent traveller program