You will find useful information on entry restrictions on official websites by clicking here: https://www.iatatravelcentre.com/international-travel-document-news/1580226297.htm?pub=autodetect and here: https://www.icao.int/safety/Pages/COVID-19-Airport-Status.aspx.
We have also included the main special measures for the countries we fly to on our site. You will find them by clicking here: https://www.luxair.lu/en/offers/entry-regulations-and-flight-program