When you arrive in Xiamen by air be advised that there is no transfer area as you might know from other airports like Bangkok or Singapore. You always have to pass through immigration.
The transfer desk for Xiamen Airlines is a little bit hidden away. when you exit customs control just walk down the hallway and it is on your right hand side.
Left luggage (to store your bags) is available on the arrival level.
A taxi into town will cost you about 40 to 50 RMB (around 5 to 7 Euro).
Watch the video for a full guide from plane door to the taxi stand including a visit to the transfer desk.