Update README.md

README.md

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 # 1. About Dataset
 **AirCa** is a publicly available  aircraft cargo loading dataset with  millions of instances from industry. It has three unique characteristics: 
-(1) Large-scale, AirCa contains in total 6,071k records and 1,092k flights generated by 491 aircraft fleets, covering 6 aircraft types and 425 airports over a total span of 9 months. 
+(1) Large-scale, AirCa contains in total 6,071k records and 1,092k flights, covering 6 aircraft types and 425 airports over a total span of 9 months. 
 (2) Comprehensive information, AirCa is delivered to provide rich information pertaining to aircraft cargo loading, including detailed cargo characteristic information, loading-event logs, flight destination, and comprehensive loading constraints in practical scenarios.
 (3) Diversity,  AirCa aims to increase data diversity from three perspectives: destination diversity, Flight diversity, and Constraint diversity.