Yet, it is only since the 1960 ’ s ​ — with the introduction of flame - retardant fabric, coupled with a safe and inexpensive system of burning propane used to heat and regulate the air temperature inside the balloon — ​ that ballooning as a pleasure sport has really got off the ground.
Siiski sai õhupallisport hoo sisse alles 1960. aastatel, mil võeti tarvitusele gaasitihe riie ning hakati kasutama ohutut ja odavat propaani, et kuumutada ja reguleerida pallisisest õhutemperatuuri.