Air and sunlight are reliable, they are always there That is why you don't often hear people thanking them.
The irony is that air and sunlight are critical for humans to survive. Without air, we will literally die in a few minutes. Without sunlight, our agriculture, food supply, and most animals would go extinct within months. But you will barely hear people waking up in the morning, saying "Thank you, there is air!" or "Thank you, there is sunlight!"
Why?
Because every morning you wake up, the air is always there. The sun always shines. They are reliable.