<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">lighter than air aircraft</topic></authority><related type="narrower"><topic>airships</topic></related><related type="narrower"><topic>balloons</topic></related><related type="broader"><topic>aircraft by form</topic></related><variant type="other"><topic>aerostat</topic></variant><variant type="other"><topic>aerostats</topic></variant><variant type="other"><topic>aircraft, lighter than air</topic></variant><variant type="other"><topic>aircraft, lighter-than-air</topic></variant><variant type="other"><topic>lighter than air craft</topic></variant><variant type="other"><topic>lighter-than-air aircraft</topic></variant><variant type="other"><topic>lighter-than-air craft</topic></variant> <note xml:lang="en"><![CDATA[ Aircraft weighing less than the air they displace, sustaining lift by displacing the air using aerostatic bouyancy. ]]></note></mads>