Ballooning spider : A spider which has the habit of rising into the air. Many kinds ( esp. species of Lycosa) do this while young by ejecting threads of silk until the force of the wind upon them carries the spider aloft.

Example:


Taxonomy
07-18, Journal of Arachnology, balloon, free encyclopedia, ballooning spiders, Suter, kite, Spider silk, threads, mechanically, abdomen, parachute, winds, Heimer, spiderlings, adults, drag, Flying Kites.

Defination from the web:
ballooning behavior by Linyphiid spiders (Araneae, Linyphiidae) ... Ballooning: Data from spiders in freefall indicate the importance of posture" ... Ballooning spiders in Missouri, USA, and New South Wales, Australia: Family and mass distributions" ...