Michael Kellar, 56, must not have realized his large-sized cellphone screen was legible to the passenger seated behind him on the flight. "It was in large font, and she sees certain words and starts contemplating there's something bigger there," Jourdenais told the paper.
"Then the conversation transitions to children. That's the moment when she decided to preserve the evidence as best as she could."
According to police, the teacher snapped her own cellphone photos of the conversations, which allegedly involved Kellar requesting the individual on the other end to perform sex acts on the kids.
The teacher then told the flight crew, who in turn contacted authorities on the ground, the Washington Post reported.
When the Southwest plane touched down, San Jose police and San Francisco-based FBI agents detained Kellar for questioning.
The Tacoma native told police the texts were just role playing and sexual fantasy, the Mercury reported. He freely let law enforcement look over the messages.
But back in Tacoma, FBI agents were busy pinpointing the identity of the other party.
Capt. Mike Edwards, commander of the Seattle Police Department's Internet Crimes Against Children task force, told KIRO 7 that investigators traced the messages to a woman Kellar had met via an online dating site. Eventually, the trail led law enforcement to Gail Burnworth, 50, of Tacoma.
At a news conference Thursday, San Jose Police Sgt. Brian Spears said investigators were able to rescue the children before the assault. Burnworth was babysitting the children. "Extremely disturbing," he said.
"Folks that are doing these sort of things are literally all around us," Edwards told reporters. "We don't know who they are. The discussion that was going on was very disturbing, about harm to children," he told Q13 Fox TV.
"Had she had not come forward, had not done anything with this, they would have carried out their plans and intentions. . . . They need to be punished and they need to be kept away from kids."
"I'd like to highlight that if it wasn't for this particular passenger taking action to alert the staff and alert the police, this catastrophic event would have been horrific," said Spears. "In my eyes, she is our hero."
Kellar is now in jail in Santa Clara County. He faces two counts of attempted child molestation and two counts of solicitation of a sex crime.
Burnworth was booked at the Pierce County jail in Washington. She faces charges of sexual exploitation of a minor, rape of a child, and dealing in depictions of a minor engaged in sexually explicit conduct.
It could not be determined if the two had lawyers yet to speak for them.