By Tim Hepher and David Shepardson FARNBOROUGH, England (Reuters) – Aerospace has turned the page on an unprecedented pandemic demand shock with dozens new orders at its largest air show in three years – only to face mounting worries over supply chains and reminders that its future hinges on decarbonisation. From rural Farnborough to nearby Heathrow, this week brought stark evidence of the supply crunch now entangling manufacturers and airlines alike, with shortages of both labour and parts. It comes as airlines – whose expansion had propelled the industry to record profits in the past decade,…