Do Not Walk Barefoot
Do not ever walk barefoot once on board the plane. Everything including baby urine, blood, vomit, and milk have all been spilled on the floor of a plane. You just read how often they clean the trays and blankets, so how familiar do you think the vacuums are with those floors?
The gamble is yours to take. Basically, airplanes are giant cabins you’re stuck in where germs can manifest at any time. But it’s totally still the safest way to travel. Just bring plenty of penicillin with you!