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Amortization and Depreciation

72.1 - Airworthiness Reserve Provisions ‑ Airframe
72.3 - Airworthiness Reserve Provisions ‑ Airframes (credit)
72.6 - Airworthiness Reserve Provisions ‑ Engines
72.8 - Airworthiness Reserve Provisions ‑ Engines (credit) 

75.1 - Depreciation ‑ Airframes
75.2 - Depreciation ‑ Engines
75.3 - Depreciation ‑ Airframe Parts
75.4 - Depreciation ‑ Aircraft Engines
75.5 - Depreciation ‑ Other Flight Equipment
75.6 - Depreciation ‑ Flight Equipment
75.8 - Depreciation ‑ Maintenance Equipment and Hangers
75.9 - Depreciation ‑ Ground Property and Equipment

74.1 - Developmental and Preoperating
74.2 - Intangibles ‑ Other

73.1 - Obsolescence ‑ Current Provisions
73.2 - Obsolescence ‑ Inventory Decline Credits

87.4 - Premium on Debt

89 - Property acquired through merger, consolidation, etc. ‑ amortization of excess of purchase price over net book value