为满足航空公司提高服务等级，增强市场竞争力的要求，对飞机系统进行改装，如调整座椅间距、升级或增加客舱服务及娱乐设施，增加头等舱等。

In order to meet the requirements of airlines company for improving service level and strengthening market competitiveness, modification of aircraft system has been performed, such as adjusting seat spacing, upgrading or increasing passenger cabin services and entertainment facilities, increasing first-class cabin, etc.

客户化工程设计、方案的批准、载重平衡及相关资料修订Customization engineering design, approval of scheme, weight and balance of related documents.

A320 series  B737-NG