One of the only memories I have of the United Kingdom (having moved to Canada at the age of four) is of us getting onto a double decker bus with a bonnet that was loose, and seemed like it was going to rattle off the vehicle. My parents couldn't remember that, or the rocky hill we climbed to get to the bus stop.
The sentence we're discussing, though, could be a reverent request from someone who appreciates antique buses. Or is scared of its condition...
I'm sorry KINDLY PATRON, this bus's age is not your business. I'm not running a black car.
I tried it on a random tour bus driver in China once, (Well the question was in chinese) and they got super mad at me. Black cars are illegal or something idk. The answer that she told me, is translated above.
English conjugation of 'to be' is as follows: I am, you are, he/she/it is, we are, you (pl) are, they are. The bus is a single object, that in English is called 'it'. 'Are' would be incorrect.