An odd situation when Johnson County residents saw a large plane circling overhead Tuesday night, wondering what was wrong.At 7:40 p.m. Tuesday night, American Airlines Flight 1849 took off from Charlotte Douglas International Airport (CLT) after a weather delay.Shortly after takeoff, American Airlines spokespersons said the Airbus 321 Twin-Jet aircraft began experiencing a potential mechanical issue.To avoid hazardous weather ahead and drop weight, the plane began circling over the Appalachian Mountains, where it was seen by the residents of Mountain City.It returned to North Carolina and no one was hurt.