Does the 144 hour visa free transit apply if flying with different airlines?

Dear TravelChinaGuide,

I'm flying from Spain to Shanghai with AUSTRIAN AIRLINES. Flight date is 24 July.

Then, I'm flying from Shanghai to Tokyo with JUNEYAO AIRLINES. Flight date is 28 July.

Does the 144 hour free transit apply in this case where the airlines are different? Which documentation should I need? Should I communicate both airlines this situation?

Thanks in advance,
Bests,
Carlos.