Merced to Yosemite: 69 miles
Modesto to Yosemite: 84 miles
Stockton to Yosemite: 95 miles
Fresno to Yosemite: 65 miles
Mammoth to Yosemite: 42 miles
These distances can vary depending upon which side of the park you wish to access. MMH access is the non-developed east entrance via Lee Vining.
I'm not sure MMH was receiving jet service in 2000, but I know Fresno was.