Table 2.
Subfamilies with the highest median fluorescence intensity ranks in aircraft air samples and corresponding subfamily ranks in outdoor air samplesa
| Subphylum, class, family, and subfamily | Associated habitats | Aircraft air median rank | Outdoor air median rank |
|---|---|---|---|
| Bacilli Halobacillus Halobacillus sfA | Marine | 1 | 24 |
| Bacilli Bacillus Bacillus sfA | Soil; water; human‐associated | 2 | 1 |
| Bacilli Unclassified Unclassified sfA | Soil; water; human‐associated | 3 | 5 |
| Bacilli Lactobacillales Streptococcaceae sfA | Respiratory, skin, oral; LAB | 4 | 53 |
| Bacilli Exiguobacterium Exiguobacterium sfA | Permafrost, sediment | 5 | 60 |
| Sulfobacillus Sulfobacillus Sulfobacillus sfA | Hydrothermal vents; metal; bioreactors | 6 | 39 |
| Clostridia Unclassified Unclassified sfA | Gastrointestinal tract | 7 | 2 |
| Actinobacteridae Intrasporangiaceae Intrasporangiaceae sfA | Oral; sludge | 8 | 3 |
| Bacilli Paenibacillaceae Paenibacillaceae sfA | Soil; water; human‐associated | 9 | 18 |
| Bacilli Marinococcus Marinococcus sfA | Soil | 10 | 145 |
| Bacilli Aneurinibacillus Aneurinibacillus sfA | Geothermal; soil; sludge | 11 | 67 |
| Bacilli Planococcaceae Planococcaceae sfA | Ice; soil; manure | 12 | 41 |
| Bacilli Geobacillus Geobacillus sfA | Soil; hot springs; petroleum | 13 | 92 |
| Bacilli Thermoactinomycetaceae Thermoactinomycetaceae sfA | Hydrothermal vents; air conditioners | 14 | 15 |
| Clostridia Clostridiales Acetivibrio sfA | Aquifers; cellulose‐degrading community | 15 | 19 |
| Bacilli Lactobacillales Lactobacillaceae sfA | Gastrointestinal tract; LAB | 16 | 29 |
| Clostridia Clostridiales Unclassified sfB | Gastrointestinal tract | 17 | 13 |
| Opitutae Opitutaceae Opitutaceae sfA | Soil; termite gut | 18 | 97 |
| Bacilli Marinococcus Marinococcus sfB | Saline soil | 19 | 12 |
| Bacilli Lactobacillales Unclassified sfA | Gastrointestinal tract, LAB | 20 | 113 |
| Alicyclobacillus Alicyclobacillus Alicyclobacillus sfA | Soil; hot springs | 21 | 83 |
| TM7‐3 EW055 Unclassified sfA | Soil; sludge | 22 | 30 |
| Bacilli Lactobacillales Carnobacteriaceae sfA | Food‐associated; equine manure clone; LAB | 23 | 178 |
| Actinobacteridae Gordoniaceae Gordoniaceae sfA | Skin; respiratory; sludge | 24 | 20 |
| Planctomycetacia Planctomycetales MPL7 Unclassified sfA | River biofilm | 25 | 331 |
aSubfamilies were ranked based on the operational taxonomic units within the subfamily with the highest median rank. 809 subfamilies were ranked.
LAB, Lactic Acid Bacteria.