I believe they require(d) N95 masks, at least Lufthansa did. Am I correct?
FFP2, KN95, N95
“Generally, the only exceptions to this rule are children under six years of age and persons who are not able to wear a mask for medical reasons.
(NB: on flights to the USA, all passengers, including children over the age of two, are required to wear face masks.)
We will only accept an exemption to the compulsory wearing of a mask on presentation of an approved negative Covid-19 PCR test result (no more than 48 hours old at the start of the journey) and a doctor’s signature on the corresponding Lufthansa Group medical certificate form.“