This year’s English Camp (still few places available) will be about various heroes. We probably won’t include Superman, but this is a funny comic nonetheless.
Baggage is of course another word for luggage, but it can also refer to emotional baggage, like, in this case, fear of flying. So Superman is suggesting he should charge extra for this kind of baggage.
By the way, that awkward moment when you laugh at your own joke and nobody else is laughing is usually accompanied by the sound of chirping crickets in comedies, to emphasize the silence. In real life, you just hope the conversation will move on