I have Feathers

People buy me to eat but never eat me.

What I am?

You see a boat filled with people, yet there isn't a single person on boat.

How is that possible?

What has one eye but can’t see?

Where does Friday come before Thursday?

Guess what comes next in the sequence:

1 2 3 4 5 ? 

The answer is not 6. What is the answer?