Fume event

So that's one.

The second one is what's called fume events.

So because the air is coming in through the engine, if there's any burning of engine oil or other things, then some of that can get sucked into the air.

And you might imagine that the oil used in a high bypass gas turbine that flies a tin can through the air at 100 miles an hour is not like Crisco.

And so suddenly, if you multiply it by the 10 plus million flights, that's thousands of flights per year.

There's a lot of people on each flight.

So suddenly, tens of thousands of people in the US alone are getting exposed to these fume events.

And now not all of them are probably burning the worst stuff like I mentioned, that engine oil that may have organophosphates.