What time does the bus from Tanggu Meihua to Tianjin Airport leave at the earliest?

Meihua Building at the intersection of First Street and Huanghai Road in Tanggu Development Zone, the first bus leaves at 5: 30 in the morning and runs every half hour. Last flight at 7:30 p. m. It takes off at 8:00 a.m. outside Gate 7 of Binhai International Airport, and it runs every half hour. The last flight ends at 9: 30 pm, and the fare is 25, which is about 50 minutes' journey. Don't give up halfway