Survival be able to fly in custom worlds

[CatBoyDinos]

Minecraft username:

CatBoyDinos​

Suggestion:

be able to fly in custom worlds​

Detailed description:

Be able to use /fly in cartenon temple and the rest temples​

Reason(s):

We have the /fly command, why cant we use it inside other worlds? Seems unfair considering some of us paid for that perk and cant use it inside there​