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42.2 - Aircraft engine repairs ‑ associated companies
43.2 - Aircraft engine repairs ‑ outside
43.7 - Aircraft interchange charges ‑ outside
42.7 - Aircraft interchange charges ‑ associated companies
42.1 - Airframe repairs ‑ associated companies
43.1 - Airframe repairs ‑ outside
37 - Air‑ground radio service
41 - Appraisal fees
41 - Architect fees
40 - Attorney fees and expenses
41 - Audit fees
43.9 - Bank service charges
60 - Billboards
39 - Commission ‑ traffic, Group I carriers
39.1 - Commission ‑ passenger traffic, Group II and III carriers
39.2 - Commission ‑ cargo traffic, Group II and III carriers
41 - Consultants
43.9 - Credit and billing services
60 - Direct mail advertising
60 - Directories, guides and programs
60 - Displays
37 - Equipment installation charges
41 - Engineering services
42.6 - Flight equipment repairs ‑ associated companies, Group I carriers
43.6 - Fight equipment repairs ‑ outside, Group I carriers
43.9 - Fuel Servicing (in-to-plane fees)
43.9 - Housekeeping and support services  
42.8 - Interchange service charges (general) associated companies
43.8 - Interchange service charges (general) outside
37 - Intercommunication equipment
41 - Laboratory services
40 - Law books
40 - Legal fees and expenses
40 - Legal forms and supplies
40 - Litigation costs
60 - Magazines and trade publications
41 - Market and traffic surveys
41 - Medical
37 - Navigation facility user charges
60 - Newspaper advertising
42.3 - Other flight equipment repairs ‑ associated companies
43.3 - Other flight equipment repairs ‑ outside
42.9 - Other services ‑ associated companies
43.9 - Other services ‑ ou‑tside companies
60 - Posters and signs ‑ advertising
60 - Radio ‑ advertising