Can I drop off a rental at the airport?

Yes ,but check with the airport of your choice first.

Yes. Great staff at the airport. Had a flight cancelled and just drive home to Ohio. Called them and let them know and wasn't an issue

Yes. If you need to drop off the car at a different office than originally planned, including airport, that is not an issue. If you call enterprise first, they can let you know any expected price change if there will be an extra fee due to airport fees.

Yes. may be a additional fee ..if its not worked out at the time of rental

Yes you can, even in other state