So after calling the American Platinum line tonight it got into a heated debate by a know it all agent who said Cathay will under no circumstances
transfer the bag from LAX to Hong Kong to Singapore
The reason being is that the ticket is booked through American
I am starting in San Diego with American Eagle where I fly to LAX then going onto Hong Kong with Cathay

They are claiming that I will have to pick the bag up in Hong Kong and check in all over again because the Singapore Airlines ticket is booked on a separate ticket
just as I had originally feared UGH
I'm thinking to tag the bag to LAX then maybe Cathay will check the bag all the way through to Singapore?

Experts Help !!!!!!!!!!
I'm back to square one!~ sigh or I hopefully have another clueless agent
Complicated!