At present, the fleet of China Eastern Airlines still has 16 73A.
The 737 mentioned by the landlord should refer to the 737-700, which is a relatively new aircraft in the 737 series and a direct substitute for the 737-300. Production started from 1993, and it has not stopped up to now. Comfort is higher than 737-300.
China Eastern Airlines currently has 4 1 737-700 aircraft.