Best in class is IBERIA airline:

If you just want to unsubscribe from their Newsletter, they require a KYC with ID or passport uploaded. Luckily, simplelogin.io exists. That way, I can just turn off or delete this forward email address and delete the account in the password manager.

I will adopt your habit of deleting at least one account per week, and will start with my best-in-class candidate.

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But airlines have a LOT of details about you, which will inevitably leak. Spam is the least of your problems.

E.g. I recently got an out of the blue password reset email from an airline I flew with a decade ago. That was my prompt to kill that account, it might have been from even before I used a password manager. No idea if someone tried to break into that account. Or if they just did a system wide password reset after they'd been compromised or something, in which case it was too late :-)