Abstract: Wind tunnel testing is a fundamental means of obtaining aircraft aerodynamic characteristics, evaluating and analyzing the performance of aerodynamic design, and predicting flight performance. The reliability of wind tunnel tests, regarding accuracy and precision, depends not only on the testing techniques but also on the data correcting method, which is particularly crucial for large airplanes. This paper first summarizes the research progress of the aerodynamic force and load testing techniques for large airplanes in a 2.4-meter transonic wind tunnel. Then, it introduces the advancement of methods for correcting wall interference, support interference, and deformation effects. The accuracy and precision of the test data of a large airplane are quite good, indicating that the test techniques and data correction method for large airplanes in the 2.4-meter wind tunnel meet the testing requirements and thus are capable of obtaining the aerodynamic characteristics of high-speed large airplanes. The results are essential in promoting the development of China's large airplane aerodynamic testing capabilities.