Airports already have several ways to move aircraft along taxiways
- Aircraft engines (least economical but always available)
- Tugs (often used for pushback from terminals)
- Aircraft wheel-motors (some makers are at least planning for electric taxi)
A system of fixed chains along a complex network of intersecting taxiways would be expensive to install and maintain and might be unreliable (e.g. icing up in cold weather).
See also