As long as your child is over the age of twelve and has an ID card or school certificate, then you can let them travel alone on Avianca flight according to the Avianca minor travelling alone guidelines. The Airlines’ policy is to allow children under 18 years old travelling alone to take one carry-on bag, which needs to be small enough for a seat in the aircraft or under the seat. They have a maximum of two pieces of hand baggage, again which should fit under the seat on board. The children need to show proof that they are under the age of eighteen, with either an ID card or school certificate. They also need to show their parents' contact details.