Roundtrip first class fares between Lahore or Karachi, Pakistan and New York JFK are widely available for travel on Etihad — including Etihad’s Airbus A380 First Class Apartment — for less than $3500. One-way fares between Pakistan and New York are available in first class for less than $2000.
This is expensive, of course, but it’s closer to what you’d expect for a reasonable business fare than a first class fare.