The plane was half empty and the flight attendant told them there was plenty of room to stretch out if they liked. They found a center row with 4 seats across near the rear of back of the plane. No other passengers ventured that far back so they felt pretty isolated. Dan sat between the girls and once the plane was off the ground the pilot announced he would dim the cabin lights and everyone could get some sleep before they served breakfast prior to arrival.
As soon as the lights went down Dan felt a hand from each girl slide across the front of his pants. He was hard in an instant. Pretty soon both hands were inside his sweat pants stroking his cock. All three were covered with blanket so no one would have seen anyways but Dan looked around. He could see the flight attendant in her seat with her eyes closed. At this point both Amy and Callie ducked their heads under the blanket and each licked on Dan's dick. Dan couldn't tell who but soon he was being sucked deep into a mouth while his balls were played with. Dan leaned back and enjoyed. He could tell the girls were taking turns sucking him. After a few minutes the girls popped their heads out and Callie whispered both she and Amy wanted to join the mile high club. The plane bathrooms weren't big enough for all three so the girls would have to take turns.
Dan picked a number between one and ten and Amy won so she headed back to the bathroom first. Dan waiting a minute and then got up and headed back. The flight attendant seemed to be sleeping so Dan quickly joined Amy in the bathroom. Amy embraced Dan and they kissed passionetly. Dan's hand began to roam down Amy's back and under her dress. Dan was surprised she wasn't wearing any panties. Amy explained she had hoped they would end up in here and she knew it would turn him on. Dan turned Amy around so he was behind her and they were both looking into the mirror. Dan pushed his pants down and raised Amy's dress. "Give me your big daddy cock" Amy hissed. Dan filled Amy's request by filling her pussy with his 6 inch thick cock. Dan reached around and squeezed Amy's perfectly shaped tits. He pulled the top of her dress down so he could see her erect nipples. With each thrust Dan could watch Amy moan. He loved looking at her face as the pleasure inside her grew. Amy liked seeing herself getting fucked. As Dan thrust away they both needed to control their noise. Dan was sure the flight attendant might hear them. The pace quickened and Dan could see Amy beginning to orgasm. That was all he could take and one final thrust and he shot his load deep inside his daughter's best friend.
Dan pulled his pants up, straightened his hair and quietly opened the door. It didn't look like the flight attendant had moved so Dan told Amy to go send his daughter in. Amy slipped out of the bathroom and found her legs were a little wobbly. Callie was checking her phone when Amy told her it was her turn with "daddy". Callie eased back to the bathroom and Dan opened the door. Callie entered and Dan locked the door. Callie didn't want to get cum on her dress so she quickly removed it and stood stark naked in front of her dad. Dan lowered his pants and Callie leaned down to suck it. She loved she could taste Amy on his cock. Callie sucked until Dan was hard again. Then turned around and pushed her ass back towards him. "Do to me what you just did to Amy!" Dan was happy to oblige. The image in the mirror was now his 18 year old daughter. Her body was so much more shapely than Amy's. Where he could easily cup Amy's breasts, Callie's spilled out around his hands. Her nipples were darker and rounder but just as hard. Dan entered her and Callie smiled. She reached down and fingered herself as her daddy thrust away. She had been fingering herself at her seat while Amy was busy with Dan so she was ready to go. Dan held her hips as he thrust. He had only cum a few minutes before so he was able to plow into Callie for a bit. Callie's face went from smiles, to moans, to biting her lip trying to stay quiet. She felt an orgasm rising from her pussy and she held on tight to the sink. Callie had never really watched herself cum before and she liked it. She felt the pace quicken and dad gave out a loud moan. She could feel his cum squirt inside her. She loved it!
Dan and Callie collected themselves and Dan again peeked out the door. The flight attendant now had her back turned so Dan snuck back to his seat and Callie followed a minute later. The three spent the remainder of the flight cuddled and dozing. Dan was hoping he would have enough stamina for the girls for the 5 days. As they left the plane the flight attendant thanked them for flying and hoped they had all enjoyed their flight. Dan wasn't sure but he wondered if she knew what they had been up to.