Are u required to show a health form if u are going to fly

Nope

No you don't, if you fly domestic within USA you don't need that anymore, if you coming from any International fly, then you must along with COVID 19 test and maybe other restrictions.

No

If you are flying with in country then no, but if you are flying overseas or coming from overseas then yes.

If you Going out the country, you have to check it out the required to travel in other wide you will be fine