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The Amex Platinum for the US does provide emergency evacuation assistance at no charge in certain circumstances.
They must find a need for it, and don’t provide it just because you get sick.
See page 5 of this link:
What I did was pay for an annual policy from Allianz (note that there are probably other good providers, I’m not trying to promote them).
It covers emergency medical evacuation up to $500,000 and gives medical coverage up to $50,000, which may be spent fast if you have a major emergency.
The policy on medical repatriation (as opposed to medical evacuation ) looks to me as a non-specialist to be a little more generous than AMEX.