A man traveling on a Southwest Airlines plane to San Jose was arrested upon arrival this week after allegedly sending text messages about sexually assaulting children during the flight, police said Thursday. A fellow passenger alerted authorities to the man’s explicit messages after she allegedly witnessed him writing them in supersized script. “The conversations were very particular in regard to sex acts that were to be performed on... children,” San Jose Police Sgt. Brian Spears told NBC Bay Area. “Some of the sex acts talked about not only molesting children, but performing bestiality,” he said. Michael Kellar, 56 years old, was booked on two counts of felony attempted child molestation and two counts of felony solicitation of a sex crime. Authorities also arrested Gail Burnworth, a woman described by police as the recipient of the text messages. She faces charges including felony sexual exploitation of a minor and felony rape of a child in the first degree. Two children, ages 5 and 7, were identified as potential victims and taken into protective custody.