Here is an existing thread on the topic already. People have different tolerances for noise, so only you can make the personal call on how much it would annoy you. Some people like to go to sleep with complete silence, others don't mind some background noise. The OP on the first thread, hates the noise, others posting view it as background noise. Spend some time in the area and in the house during arrival banks at CLT.
//www.city-data.com/forum/york-...oise-over.html
//www.city-data.com/forum/york-...gent-park.html
The Regent Parkway area is in the arrival path for flights inbound to CLT. Aircraft will be at an elevation of about 2,500 to 3,500 feet in that area of Fort Mill and decelerating. You will not be impacted by departing aircraft in this area with the CURRENT departure route the FAA uses from CLT (they could always change that).
a.) Is the flight noise so significant you can hear inside: It won't interrupt a conversation and you probably won't hear it over a TV, but you will hear the noise if you are on your top floor and it is quiet in the house. You will hear it outside - some people are annoyed by it, others are not.
b.) Flights are more frequent in Regent Park area in fall and winter as they don't reverse the arrival path often. You can expect around 300-350 arriving flights per day aligned over that part of Fort Mill for arrival on runway 36R and 36C. Aircraft approaching 36L will generally be further west and not impact your area, hence you will only get half of CLT's 650 arrivals per day over Regent Park. In the summer, you might get half that amount as the airport is often operating departures to the south.
You will get train noise in the Regent Park area as well (often at night), which will fade the further you are from the crossing at Regent Parkway (near Queen City Plastics).