Welcome to the Daily Halacha. If somebody is on a plane and needs to wash his hands to make hamotzi lechem min ha'aretz (Who brings forth bread from the earth), to have bread, what does he do? Why is this even a question? Because the only place where you can wash your hands to make a Netilat Yadayim (ritual handwashing) is inside the bathrooms. The restrooms on the plane have a sink inside. There's no other place you can wash your hands.
But the issue is that you cannot wash your hands in a place of tumah, in a place where it's impure. So if one washes their hands inside the same room as the restroom, then the water that you want to use to purify your hands, because it's in the same room as tumah, as the toilet seat, as the restroom, becomes tumah, becomes impure. The second problem is that you can't make a Beracha (blessing) inside a restroom. So what do you do?
It says, if a person is stuck like that on a plane and has to wash his hands, what you do is wash your hands inside the restroom, where the sink is in the bathroom. Even though the water might become impure, what you do is cover the toilet seat and make sure everything around that room is clean. Then you wash your hands three times, and you don't dry them. You walk out of the restroom of the plane. Then you make the Beracha. Then you dry your hands. You sit by your seat and make hamotzi lechem min ha'aretz on the food, on the bread that you're eating.
Even though water inside the bathroom can become tumah, there's room to be lenient in our bathrooms these days, since they're very clean and everything, and all the waste gets flushed very fast. Maybe our bathrooms don't have a din (legal status) of tumah, even though we're usually machmir (stringent), but in a place where it's basically impossible to wash your hands. Otherwise, we're going to be lenient in such a situation and wash your hands inside, where the sink is in the bathroom in the planes. But you never make a Beracha or dry your hands inside. You do both outside the bathroom.
But this cannot be used in a house. If a person has a sink in the kitchen but doesn't want to walk all the way to the kitchen sink, then they're washing their hands in their convenience to the sink. But where the sink is, there's also a bathroom in the same room.