I often see people using aka instead of i.e.
E.g."Only one city, aka London, has hosted the Summer Olympics three times."
This is incorrect.
Aka is an abbreviation which stands for "also known as", similar to how btw stands for "by the way" or ttyl stands for "talk to you later".
I.e. is Latin and stands for "id est" which means "that is" or "namely" or "in other words".
So if you say "Only one city, aka London, has hosted the Summer Olympics three times" you're saying that only one city is also known as London. But it's not, because that one city could be any city.
The correct usage is i.e.
"Only one city, i.e., London, has hosted the Summer Olympics three times"
Which is another way of saying
"Only one city, namely, London, has hosted the Summer Olympics three times"
Or "Only one city, that is, London, has hosted the Summer Olympics three times"
Or
"Only one city, in other words, London, has hosted the Summer Olympics three times"
You use aka in the following contexts:
"Clark Kent aka Superman"
I.e. (<== see how I'm using this?) "Clark Kent also known as Superman."
Or "Meghan Markle aka the Duchess of Sussex"
In other words, "Meghan Markle also known as the Duchess of Sussex."
Now you could say Meghan Markle i.e. the Duchess of Sussex, meaning Meghan Markle, that is, the Duchess of Sussex.
However you can't use aka in the place of i.e. because some things are simply not also known as the thing you're saying it has equivalence with.
E.g. "Can you let her know aka call her"
Letting someone know is not also known as calling because you could be emailing or texting or telling in person.
You'd say "Can you let her know i.e. call her"
So i.e. has broader scope and aka has narrower scope.