What does ‘sent to airlines’ mean?

It means that the packet passes through customs and boarded the plane. You should contact with the local post office in order to check if it has arrived.
How long does it take after ‘sent to airlines’?

When the package is out of China, we must wait until about two weeks, after this time, we can check their status with the tracking number through the website of the post office in each country.

What does «Import Security Scan»?

If the status of your package is this, could be any of the following options described below:

1) If a destination of China shown in the column location, means that the package has been returned to China. You will not receive it, so you should contact the vendor and request a new sending.

2) If the country of destination is displayed in the location column, it means the package is in customs of the destination country and then will be sent to your recipient.

Is China Post the only postal service in China?

No is not the only postal service in China. There are other postal companies like UPS, TNT, FedEx and DHL among others. Anyway, China Post is the cheapest international postal service, the only problem is its slowness.

How much is charged by China Post?

Shipping will be charged according to the measure, weight, type of delivery and other services aspects. Usually, China Post small packet is cheapest than EMS, specially in the international postal services. Shipping for Airmail is almost two times more than surface mail.

How long is the transit time?

Transit time is not precise and depends on unpredictable ractors such as time, customs checks, inspections of the goods, a simple error invalid address or number, and many other factors that can influence the time of delivery. Know that the delivery time is usually longer than the time indicated by the seller. This may involve between 20 and 40 days, in some cases even more.