I used it on my face sprayed on occasionally the whole time i was there and my face did not get the slightest sun burn, I didn't even get pink from my face as usual.
I am a fair red-head, so have always used sunscreen.
I am very fair and burn easily, but I love the sun, beach, swimming, etc.
Check the security page for the airports you will be visiting for more specifics.
If you are concerned about wrinkles, age spots, and other skin damage from the sun, a broad-spectrum sunscreen can be a good choice.
However, there are some sunscreens that may expire in as little as a single year.