LAX to XIAMEN to Singapore

I want to be sure that I will get VISA Free Transit for a short 4 hours layover in Xiamen Gaoqi Airport with Xiamen Airlines. I am a US Citizens but I checked Chinese Embassy in USA website with no Xiamen Airport shown on the list. I will buy one way ticket with non stop from LAX to Xiamen and transfer to another plane from Xiamen to Singapore.

Please respond asap since I will buy ticket about 6 hours from now

Allan