As for 5. - this has been suspended for 4 months in Europe, so that airlines can stop running empty flights & still keep their slots: https://www.euractiv.com/

As for 5. - this has been suspended for 4 months in Europe, so that airlines can stop running empty flights & still keep their slots: https://www.euractiv.com/section/aviation/news/coronavirus-eu-to-suspend-ghost-flights-rule-for-4-months/ https://www.euractiv.com/section/aviation/news/coronavirus-e...