Life in The Upper Atmosphere

There are many insects and other small animals that exist high above the planet but below space. They get caught in winds that take them higher and higher, surfing the global geothermal air currents like bizarre bouncing balls. Pilots familiar with these small creatures call them 'Angels', a personal joke as they enjoy crashing their supersonic jet fighters into them as revenge for denying evolution. Whoever gets the most crystalline things etched on the glass of their plane gets a double yoghurt.