I found this phrase on a Mobil app,And I did not understand why it wrote "by me" and not "for me"
- She: I will check if there is one available.
- Me: if not,the aile seat is fine by me.
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This is precisely meaning 3 in the Oxford Learners':
(also used as an exclamation) used to tell somebody that an action, a suggestion or a decision is acceptable
‘Bob wants to know if he can come too.’ ‘That's fine by me.’
"Fine by me" is a phrase that simply means "I think that's acceptable".