Fares from Pakistan are often low but this is better than usual. I can't replicate this when starting on aa.com but Kayak links there:
Depart Islamabad, Pakistan to San Francisco, CA
Friday, September 27, 2019 to Saturday, September 28, 2019
FlightDepartArriveTravel timeAircraftClassSeats
6730 American AirlinesOperated by British Airways
11:10 AM
ISB4:00 PM
LHR8h 50m788Business
Stop: London, United Kingdom (LHR)
6146 American AirlinesOperated by British Airways
7:50 PM
LHR10:35 PM
JFK7h 45m744Business
Stop: New York (JFK)
2305 American Airlines Wi-Fi on-boardPower on-board4:20 PM
JFK8:02 PM
SFO6h 42m32BBusiness
Return San Francisco, CA to Islamabad, Pakistan
Friday, October 4, 2019 to Monday, October 7, 2019
FlightDepartArriveTravel timeAircraftClassSeats
6045 American Airlines Wi-Fi on-boardOperated by Compass Airlines as American Eagle
5:00 PM
SFO6:38 PM
LAX1h 38mE75First
Stop: Los Angeles (LAX)
6185 American AirlinesOperated by British Airways
3:30 PM
LAX10:10 AM
LHR10h 40m380Business
Stop: London, United Kingdom (LHR)
6731 American AirlinesOperated by British Airways
9:15 PM
LHR9:25 AM
ISB8h 10m788Business
Cost summary
Your total
$1,980.31
Includes all taxes and carrier-imposed feesPassenger
Similar itinerary to LAS for $1,811.43 or DFW for $1,703, PHX, JFK, etc. I haven't played around with the routings.
I don't see the fare conditions or even booking class anywhere. Can anyone help?