Smaller airports are a bigger problem than large ones: https://www.politico.com/news/2023/02/20/aviation-lead-fuel-00081641

I live near an airport (specifically under the path that most planes take when departing) and I don't have kids but there's an elementary school near my house that dozens of small airplanes fly over every day. I've had the soil around my house tested and it has slightly elevated levels of lead but still under the EPA's "safe" limit.

We live at 4600' and most of our food gets shipped from central California. People who are new to town think most of the food at the store has spoiled because the containers are bulging when they get here. You learn quickly to poke a tiny hole in the middle of the yogurt seal and let the air out before peeling back the edge. I also have to be careful opening brand-new mason jars because the lids will stick just long enough to get the rings off then they shoot across the room with a loud pop.

That water isn't permanently lost though. When the structure of the plant oxidizes either slowly (decomposition or animal digestion) or rapidly (fire) most of the hydrogen combines with oxygen from the atmosphere to form new water molecules.

My friend just moved to the UK with her dog and it took her weeks of vet visits, sending paperwork to US and UK officials, then booking a berth at the Heathrow receiving center and trying to find a flight on the same day as the berth reservation. Total cost was more than $2500, not counting her own airline ticket.