Revenues on the contracts were initially recognized upon delivery of equipment with the remaining revenues under the contract being recognized over the installation period based on the relationship of incurred labor to total estimated labor. The provisions of SAB 101 permit WCG to treat this change in accounting principle as a cumulative effect adjustment consistent with rules issued under APB Opinion No. 20. Planned route miles are the total route miles that we expect the Williams network to traverse upon completion. Single fiber network route miles are the route miles traversed by the single fiber-optic strand that Williams excluded from the sale of its original network to LDDS in 1995. Other route miles wholly owned are those other route miles that we wholly own or will wholly own and either have constructed or plan to construct along our rights of way.
Rights of way are rights to install fiber-optic cable along routes owned by other parties.
Route miles under our asset defeasance program are those route miles that we constructed over our rights of way under our asset defeasance program, and which we began leasing in year 2000. The asset defeasance program provided cash which we used, as agent for a trust, to buy and install fiber-optic cable and equipment in order to construct portions of our network. Route miles jointly owned are those route miles which we jointly own or will jointly own. Route miles through dark fiber rights are those route miles over which we plan to obtain rights in dark fiber. Planned retained fiber miles are those fiber miles of our completed network that we expect to retain for our use in serving our customers.