Are you asking what a privacy statement and personally identifying data is? If so, "privacy statements" are documented for a client, to inform someone how their information will or will not be used either publicly or privately with other sources. It's mainly used to protect each side legally. "Personally identifying data" is anything that can identify you as a person. Your driver's licence, your medical card, your passport, your visa, anything that can prove your identity that usually has your photo and/or signature on it with information that includes your name, birthdate, and maybe other personal details such as height/weight, sex, hair and eye colour.

You're writing is quite good, but it's easier to read short sentences In a privacy statement relating to its biometric system, Emirates says the airline links passengers' faces with other personally identifying data. It includes passport and flight information. This information can be kept for “as long as it is reasonably necessary for the purposes for which it was collected.” What is a privacy statement and personally identifying data?