It’s typically best to fly out from Hong Kong to Greensboro at midday. Doing so could potentially save you 6% on the flight price compared to flying in the morning, which is usually more expensive.
For a flight from Hong Kong to Greensboro, you will be flying into Greensboro/H. Point. Greensboro/H. Point (GSO) is just 13.5 km from the centre of the city.
This is defined as Hong Kong Intl Airport (HKG) and Greensboro/H. Point Airport (GSO). Codes like Greensboro/H. Point Airport are often used to just call airports uniquely.