@evan_greer They didn't NEED to change policies at all (and certainly not mid-flight), they chose to.
Most airlines had their own mask requirement before there was a federal mandate.
@他们根本不需要改变政策（当然也不需要中途改变），而是选择了改变。
在联邦政府授权之前，大多数航空公司都有自己的口罩要求。
@evan_greer They didn't NEED to change policies at all (and certainly not mid-flight), they chose to.
Most airlines had their own mask requirement before there was a federal mandate.
@他们根本不需要改变政策（当然也不需要中途改变），而是选择了改变。
在联邦政府授权之前，大多数航空公司都有自己的口罩要求。