How can depreciation be down? Don't they mean it's just being amortized over a longer period? Or have they fully depreciated what should be an aging fleet or have they disposed of a about a billion bucks worth of assets? Accountants....
Different airlines use different schedules, mostly straight line with varied terms. Cathay Pacific use 20 years from memory and 25 for freighters, Singapore 15 years, both to 10% residual value.
Qantas are the same 10-20 years between the various aircraft.
Amazingly a write down is subject to
management timing and discretion: A little nudge to auditors and 'oh the book value is too high compared to the second hard market' and the write down gets done...
Ever wonder why Mr. Joyce predicted exactly when Qantas mainline was to be profitable again? Not only did his bonus depend on it, the timing was his to start with...