Johannesburg was not changed to jozi, Jozi is a nickname for Johannesburg. The official name is still Johannesburg, commonly people (mainly locals) refer to it by nicknames; Jozi or Joburg.
It would depend on which part of the USA, from Johannesburg to New York it is about a 20-hour flight.
Johannesburg
New York, NY (NYC) to Johannesburg (JNB)Flight Duration 17 hours 25 mins
Flight:New York, NY (NYC) to Johannesburg (JNB)Flight Duration 17 hours 10 minsDistance:The distance between New York, New York and Johannesburg, South Africa is 7960 miles (12810 km).
Soweto
OR Tambo International Airport.
Johannesburg
Have You Heard from Johannesburg Road to Resistance - 2010 was released on: USA: 14 April 2010 (New York City, New York)
About 14 and a half hours
Independent Lens - 1999 Have You Heard from Johannesburg The New Generation 13-9 was released on: USA: 2011
Soccer City Stadium.