Hard to miss
Even if you come up with an airport pickup sign, there’s no guarantee that the person you’re picking up will actually spot it. This is why you have to come up with the most absurdly hilarious signs ever. The bigger your sign is, the greater the chance that they’ll see it from a distance.
If all else fails, bring a cutout of the face of the person you’re picking up. See what these people did? Now, the person they’re picking up will know where to go immediately after landing. He probably noticed it while still several thousand feet up in the sky.