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In this Commentary, we suggest that the study of the distribution and function of air sacs in tracheate arthropods can provide insights of broad significance. We provide preliminary phylogenetic evidence that the developmental pathways for creation of air sacs are broadly conserved throughout the arthropods, and that possession of air sacs is strongly associated with a few traits, including the capacity for powerful flight, large body or appendage size and buoyancy control. We also discuss how tracheal compression can serve as an additional mechanism for achieving advection in tracheal systems. Together, these patterns suggest that the possession of air sacs has both benefits and costs that remain poorly understood. New technologies for visualization and functional analysis of tracheal systems provide exciting approaches for investigations that will be of broad significance for understanding invertebrate evolution.<\/jats:p>","DOI":"10.1242\/jeb.245712","type":"journal-article","created":{"date-parts":[[2023,5,19]],"date-time":"2023-05-19T12:43:02Z","timestamp":1684500182000},"source":"Crossref","is-referenced-by-count":18,"title":["Air sacs are a key adaptive trait of the insect respiratory system"],"prefix":"10.1242","volume":"226","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5223-216X","authenticated-orcid":false,"given":"Jon F.","family":"Harrison","sequence":"first","affiliation":[{"name":"School of Life Science, Arizona State University 1 , Tempe, AZ 85287-4501 , USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0295-4532","authenticated-orcid":false,"given":"Evan K. 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