Some parents are getting annoyed about their kids coming home late from school, because of a delay involving their school buses. 

One mom says her daughter got home an hour late three days in a row and the Palm Beach County School District never alerted her. 

There are GPS devices on all buses, but the district doesn't yet have the software to make the information available to parents. 

There are apps that would work with parents' smart phones to inform them when buses are late, but district transportation officials say they're evaluating the security of its own system before it works with any outside vendors.