Fair enough. Flight packs are a general term meaning a package deal for the electronics needed to control the plane. You buy one of these if you have a transmitter you like and need the parts that go into a new plane. There are different packs that you can get. You can get them that includes either 3 or 4 servos. They also include a receiver, a receiver crystal, an on/off switch, and a 4 cell battery pack for the reciever which all mount in the plane. If you order a pack you will need to specify the reciever type and channel number so that it matches your transmitter. Sometimes, there are specials where you can also get a 4 channel transmitter included at less than the price of the flight pack alone. These are the best deal and also gives you a spare transmitter. Hope this helps. Fast![8D]