<<Airports need an area for spotters, photographers, children and who ever!
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The airports don't need any such thing - it's the spotters who want the airports to provide space for them!
I know there are many airports with such facilities but the subject of this thread is Heathrow and there is painfully insufficient space in the central area for people other than staff and passengers. Returning the roof gardens to full spotting facilities would cost a small fortune and in the current financial climate I for one would be very distressed to see such a waste of money.