航空公司正在将客机改成货机

e-commerce – n. activities that relate to the buying and selling of goods and services over the Internet

aviation – n. the business or practice of flying airplanes, helicopters, etc.

freighter –n. a ship or airplane designed to carry goods and products over long distances

slot – n. a period of time that is available or used for a particular occurrence, event, etc.; a place or position in an organization, group, etc.

overhaul – n. to act of looking at every part of (something) and repairing or replacing the parts that do not work