The easiest thing that you can see regarding the difference between the 300 and 300ER are the engines with their logos.
The 300 is a Rolls Royce one, and the 300ER is one from GE with 115,000lbs. Just tick it in at google, you'll see the logos..
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Someone news regarding the recruitment policy? Is it still closed for ab initios (non-HKID)?