Hey there, i've never personally experienced this but I'm sure many people have before so you're not alone.
I am a psychology student and although really I have no idea what i'm talking about it may be a suppressed fear which has been triggered to suddenly appear. Sometimes when you're under a lot of stress fears can arise as a way o cope with everything as your mind doesn't really know what to do with itself. Although claustrophobia seems completely unrelated to anything else, it could be due to having no escape currently and fearing situations where you cannot escape (related to your aeroplane fear, this also potentially may be more related to agoraphobia). Have you got anyone around you for support at the moment? Or a professional you can talk to before the fear escalates? A professional will be able to help you undertand why this fear has come about :)
Take care <3
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