They are not any more at risk of igniting on a plane, but the consequences if it does happen are potentially a lot more severe. Especially so if they ignite in the cargo hold where it’s more difficult to both detect, and extinguish any fire that might break out.
This is also why you’re told not to adjust your seat (and get a flight attendant) if you drop your phone in it – the adjustment mechanisms could puncture the battery.
This video is a great (but long!) discussion of an accident caused by lithium battery cargo.
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