While most people are concerned about how high you fly,few cares about how tiring your flight is,and that,is the meaning of friendship. 我觉得你的中文句子逻辑上就有问题,这就是友情里的“这”和前文不符.所以我的翻译里给你加了个meaning
There will be few people think of if you are tired while most are thinking of that your flight level , that's friendship. 没必要逐词翻吧..其实本来就有这句谚语 但是一时想不起来了``= = LS翻得很好 好像就是这个.