Of note are mirror ambigrams. Particularly vertical axis mirror ambigrams, in this instance. That is, words that could be read by reflecting the design. Basile Morin has a list of ambigrams – mirror and otherwise – that they’ve designed on their website here.

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For me personally, not including the travel to Chicago, it would be 225USD for a less than 5 hour flight from Chicago to Seattle, while the smallest cabin (“roomette”) on an Amtrak would cost 1400USD and take over 46 hours. Even the coach is 280USD.

Edit: I’m seeing the bit about short trips now; I thought that the comment I was replying to was about travel in general. Chicago to Detroit would only be 35USD for ~6h on Amtrak coach (no cabin offered), flight price would be the same as Chicago-Seattle. Train would be cheaper in this case, though without a cabin.