For those wondering about the settlement and are new to FLYS and how I came to that figure remember the strikes:
BOT +1 BUTTERFLY NYFANG 19 OCT 18 2660/2570/2550 PUT @34.60 AMEX
So +2660 -2570 +2550
SInce FAN is below 2550 into the close here it looks like settlement will be at intrinsic value with all strikes expiring at intrinsic value:
2660 strike minus 2570 strike = +$90
2570 strike minus $2550 strike = -$20
Net difference is +$70
I paid $34.60
Gross Profit = $35.40 or $3,540 per FLY.