Foreign nationals in China can purchase air tickets through formal channels, such as airline ticket offices, official websites, mobile clients (official accounts, apps), etc., with a valid identification document (the Civil Aviation Security Inspection Rules stipulate that the valid identification documents for foreign passengers include passports, Diplomatic Identity Card issued by the Ministry of Foreign Affairs, and Foreign Permanent Resident ID Card), and go through check-in and registration procedures with the above-mentioned valid documents.

When purchasing tickets or before traveling, you should consult the airline or log on to the official website to find relevant regulations on baggage transportation, including checked baggage size, weight, free baggage allowance, excess baggage fees, prohibited items, etc.