I will travel to Europe from San Francisco in Sep. I have three outbound flights: one on Air Canada from SFO to Canada, then on Lufthansa from Canada to Europe, and then another Lufthansa flight within Europe. Since I will fly quite a few times, do you think that I can get by with surgical masks (plus a face shield)? Alternatively, do I need N95 masks? I have not used N95s and will need to find a place that does a fitting test for me.