续签或修改原有的民用航空运输协定和协议；
renew or amend air service agreements and arrangements previously in force;
双边航空运输协定自由化影响研究是对政策有效性评估的基本依据。
The measurement of the impact of the liberalization of bilateral air service agreements(ASAs) is essential to the evaluation of the effectiveness of policies.
一家空运企业根据上述规定经指定和授权后，即可开始经营协议航班，条件是该空运企业须遵守本协定中相适用的规定。
When an airline has been so designated and authorized it may begin to operate the agreed services, provided that the airline complies with the applicable provisions of this Agreement.
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