This is a lore question and SLIGHT SPOILERS.
[spoiler]If the Brotherhood can make that huge ass airship and repair a buttload of Vertibirds, why haven't they gotten ground vehicles working like all those APC's scattered around? [/spoiler]
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The roads and highway systems are all screwed up so it's just much easier for them to travel by air it would be b**** to travel in a vehicle even if you put treads instead of tires but I see what you are saying
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Cuz... Reasons... Also if you can fly then why drive? It's also probably safer too...
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Vertibirds crash hourly for seemingly no apparent reason, safer? I think not
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That's cuz either the pilots on a lot of Chema or they get shot down by the odd missile launcher... If they travelled by land then they'd most likely come across a lot more problems - it's also a lot easier to take things down from the air - remember the first mission you're given from elder maxwell on the prydwen? Unless you tell the vertibird to land so you can fire mini nukes, you can take out the behemoth and any other enemies quite easily with the minigun hat has infinite ammo
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Maybe they still run on gas? But I found a tank and got pretty excited.