"HIB Number 000724 DatefTime Transmitted: 02/11/20 10 17:34 Subject: Comment. Action Area PATHFINDER PUBLICATION CCDG LIMITED DISTRIBUTION -NOT TO BE FORWARDED ISSUE: PATHFINDER PUBLICATION SENSITIVITY: A recent edition of the fortnightly Pathfinder newslettJr published by the RAAF's Air Power Development Centre speculates about the comparative cross sections of modern western fighter aircraft.
(...) In addition, stealth aircraft avoid operating at altitudes that create contrails (the white condensed water vapour trails seen behind high flying aircraft) and fuel additives are used to reduce visible smoke trails (...)" http://www.defence.gov.au/Publications/HotIssueBriefs/Docs/HIB000724.pdf page 4
