How to ask the flight attendant for more airplane meals if there are still leftovers?
Good:
你好，请问飞机餐还有多余的吗，我可以再要一份吗，谢谢。
Bad:
喂，再来一份，我没吃饱。
In my opinion, as long as you use &quot;请&quot;, &quot;可以..吗&quot;, &quot;谢谢&quot; as the way in English,
and ask a flight attendant after their regular meal service with smile,
it is definitely a reasonable request.
A normal anwser would be: &quot;好的，我帮您看下，请稍等&quot;.