Generally, there are very few positions that require you to pay training fees when applying. If you encounter it, it is generally fake.

In places like airports, it is even more impossible to ask for training fees when applying.

Generally, in job hunting, if it involves training fees, deposits and the like, don't believe it easily. It's easy to be cheated.

Security inspectors belonging to airlines are different from those belonging to airports. Generally, the former is more demanding and may need to be trained and get better treatment. Some training institutions charge training fees under the guise of recruitment, and organize airline interviews after the training.