Am I qualified for 72 hour visa free transit or 24 hour direct transit

Hello, I am a US Citizen. My itinerary is as follows:
Thu Dec 22 New York City → Kolkata, India
JFK → PVG
12:45 AM Thu, Dec 22 – 4:55 AM Fri, Dec 23
China Eastern Airlines Flight 298
Overnight Flight
15h 10m, 7373 miles
Depart: John F Kennedy Intl Airport (JFK), New York City, NY

Arrive: Shanghai Pudong Intl Airport (PVG), Shanghai, China
- Boeing 777-300
PVG→NAO
8:25 AM - 11:45 AM
China Eastern Airlines Flight 5437
3h 20m, 931 miles
Depart: Shanghai Pudong Intl Airport Shanghai
Arrive: Nanchong Gaoping Airport Nanchong
Economy Class - Airbus A319
1h layover in Nanchong

NAO→KMG
12:45 PM – 2:30 PM
China Eastern Airlines Flight 5437
1h 45m, 437 miles
Depart: Nanchong Gaoping Airport Nanchong
Arrive: Kunming Changshui International Airport Kunming
Economy Class - Airbus A319
9h 20m layover in Kunming

KMG → CCU
11:50 PM – 11:40 PM
China Eastern Airlines Flight 555
2h 20m, 930 miles
Depart: Kunming Changshui International Airport (KMG), Kunming, China
Arrive: Kolkata Intl Airport (CCU), Kolkata, India
- Boeing 737

I have three layovers in China - Shanghai (3 hrs 20 mins), Nanchong (1 hr) and Kunming (9 hrs and 20 mins). Am I able to use the 72 hour visa to go out into Kunming for sightseeing?
Does the 24 hour direct transit allow me to exit the airport at Kunming? I am not intending to leave the airports in Shanghai or Nanchong.

Thank you