83 Ill. Adm. Code 712.260
Flight Logs
Section 712
Section 712.260 Flight Logs
a) Flight logs maintained of all aircraft usage by the local
exchange carrier are used to classify the investment in Account 2110 into three
cost pools: Regulated, Nonregulated, and Shared.
b) Flight logs are completed by the originator of the flight and
the pilot. They provide details of the purpose of the flight, the organization
using the aircraft, and the determination of whether the purpose of the flight
was exclusively for regulated or nonregulated purposes. Where the aircraft
usage cannot be clearly identified as either regulated or nonregulated, the
residual investment and associated expenses are assigned to the Shared Cost
Pool.