It's been a little over a year since actors John Travolta and Kelly Preston lost their 16-year-old son, Jett . Last week, the family's plane landed at Bangor International Airport in Maine. Someone who was not a family member was leash walking the couple's two small dogs when an airport service truck hit and killed the celebrity canines . The airport is investigating the accident. Although the Travoltas have not publicly commented on the loss of their pets, they did announce today that 47-year-old Preston is pregnant with their third child.