Exit from Japan is mystery. Private chartered flight, without stopovers, I’d guess :-)
There’ll be movie on this at some time in future.
I have dual citizenship, I was born in XX. Our Lebanese passports had expired, so my mother and I used our XX passports to fly into Beirut several years ago—I purchased a visa upon touching down, but boarder control insisted I return it, they recognized my last name [1]. Leaving two days later without being able to produce evidence of military service (I was 17 at the time) was a nightmare, and the XX government would not help seeing as how this was not their problem (the curse of a dual citizenship), but I got lucky (see [1]). Come to think of it, Lebanon was in such disarray at the time, it would have been nearly impossible to renounce my Lebanese citizenship—even today, I have no idea what the first step would be.
[1] I’m no Ghosn, but my grandfather had toyed with the idea of running for federal office in Lebanon at the time.
> Hironaka added that Ghosn's attorneys hold his passports, and that the former auto executive "could not possibly use them."
[1] https://edition.cnn.com/2019/12/30/business/carlos-ghosn-leb...
Commercial flights check your passport before you board, because there are regulations and they like to cover their own ass, but private charter flight don't have these checks if you pay enough.
Either way: he's shortlisted to be the next Lebanese president, is my guess... I think that's his long term strategy to avoid his fraud trial. You can't really arrest or extradite a head of state for fraud.