the bbc's seer -- sarah thierry followed them on one of their missions. >> a rescue just about two minutes from the polish border. >> they are private pilots from germany volunteering to fly medical supplies to the polish/ukrainian border. >> we had an emergency request from a hospital in ukraine, all of a sudden, they need 10 times the supplies delivered in no time. >> they are transporting donations of cancer treatment and insulin no longer available because of the war. also medicine to treat the wounded, body bags, and forensic kids. -- kits. >> these are for the freed up villages. little girls 15 and older have been raped. with these kits you can prove they have been raped within a certain time span and then it can be decided if they are to be given the pill to prevent pregnancy. >> ukraine air rescue is funded by private donations. there pilots often pay for gas out of their own pocket, between 1500 to 300 euros per flight. on the return to germany they are evacuating vulnerable ukrainians who would struggle to flee by train or bus. >> we are trying to reach out unaccompanied children