It is mentioned in the adjusted application conditions for temporary identification of civil aviation aircraft that temporary identification can only be used as valid flight identification for passengers of China nationality and nationality (excluding Hong Kong, Macao and Taiwan) aboard domestic civil aviation aircraft, and does not contain other purposes. Holders of residence booklet, driver's license, social security card, temporary residence permit, expired ID card, passport, expired temporary civil aviation flight identification, work permit, letter of introduction and other identification materials (original and photocopy) may apply for temporary civil aviation flight identification. If the above-mentioned identification materials cannot be provided, the passenger shall truthfully provide his name, ID number, domicile, home address, family members with the same domicile and other relevant information. Servicemen applying for a temporary flight permit must provide the original letter of introduction issued by the unit security or the political department. In addition, the validity period of the temporary flight certificate is increased from 1-7 days to 7- 15 days, and it is not necessary to apply for the temporary flight certificate repeatedly during the validity period, which greatly facilitates passengers' travel.