as soon as your instructor tells you that you can sight into jetnet. After registering, there is a 24 hour waiting period before you become "active". We were able to register today, day 3 and will be able to travel this weekend if desired. Also, you must have your badge which is also made on day 3 or 4. They understand that ppl want to go back home on the weekend, so they are pretty good about getting everything organized before then.