Sorry Mutt - good point. The airport planning document is quite unsuited to planning or running an actual operational flight.
Its value is at the 'what-if' stage to accept or reject the obvious. Once that is sorted out then one spends the money for a performance engineer to do the specific airport performance analyses. I must say that we do it that way for airport planning and design purposes as well. Since the runway and associated works cost anything from $US5,000 to $US50,000 per linear metre, a performance engineer is money well spent.