When having a layover in the USA, are you supposed to ‘tip’ for those meals/drinks?

When having a layover in the USA, are you supposed to 'tip' for those meals/drinks? Not American, from Oceania, but occasionally have long layovers in San Fran or LAX before heading to Canada. Where I'm from, tipping isn't the norm whatsoever. So, in the USA airport restaurants and bars, is it rude not to tip? Do I need to tip?
submitted by /u/No-Mathematician6635

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