Flying CDG-ATH on a Sunday morning 720am flight from Terminal 2D and staying at the Novotel. How late can we arrive to have enough time to check in and clear security? I know we can take the quick CDGVAL from the hotel to the terminal, so getting to the airport is not an issue. Trying to figure out how long I can sleep in. We are on a Delta ticket so I not sure of we can use kiosks to check in.