EVERY runway decision in NY is based on capacity, the thought of noise abatement is only ever considered on the midnight shift. The JFK atis statement about noise abatement I believe originated in the 60's and is an effort to persuade ac not to request non-standard ruways due to the impact on the operation.
JFK runway decisions almost always impact LGA. The impact may only have an affect LGA climbs but they are impacted. Nobody has enjoyed this thread more than me because I was there when it happened.
