我有一条英语题目不理解,请各位大虾指点一二

他叔叔下周将飞往上海。有如下表达法：
1、His uncle is going to Shanghai by air/plane next week.
2、His uncle is going to fly to Shanghai next week.
3、His uncle will go to Shanghai by air/plane next week.
4、His uncle will fly to Shanghai next week.
这四句话应该比较容易理解吧？用be going to或will来表示将来时态，去上海可以用go to Shanghai by air/plane，也可以直接说fly to Shanghai。
再看下面的：
5、His uncle is flying to Shanghai next week.
是用现在进行时的形式来表示即将发生的事情。