No, she gets stopped by Monica

Lacey still had her clothes in her lap and was unfolding her shirt when she noticed hands to her right grab the pile and take them away.

"Hey!" she protested, still holding her shirt up to her upper body.

"The flight attendant said you have to stay like this for the rest of the flight, remember?" Monica chided as she put the clothes underneath Joanne's seat in front of her. "You have to let go, and relax for your medical conditions" as she pulled on Lacey's shirt.

"But... but..." Lacey struggled to explain herself, but realized that she was hoist by her own petard, and had to grin and bare it as she yielded her grip on the shirt for Monica to take and put under the seat. She didn't know if Monica actually bought the medical story - she thought she could see her smirk a little - but wanted to maintain some plausibility.

Meanwhile, Sam was furiously masturbating in the bathroom, biting her lip so tightly to almost draw blood. She had put the barf bag down beside her on the floor while she went to town strumming, and would check on it later. Her pleasure train continued until just before the climax, when she heard a knock on the bathroom door.