There are tons of people in the USA who cannot speak English in spite of having been in the country for 50 years plus. Miami Cubans come to mind. Lots of Chinese in NYC too. I end up speaking Chinese with them.
@!!! Cannot thank you enough for your excellent advice, and I concur with another poster that you are a legend up there with Ubon Joe. Don't take any of the criticism personally and keep doing your thing.
This is what I'm trying to clear up--I heard that you would have to go through immigration at DMK even if just transiting. If that's not the case, it makes my life a lot easier. Thanks.