frequency(In addition to $1.2 million for the 59, the budget also includes $800,000 for the W4, a bus line that runs between Deanwood and Anacostia in Wards 7 and 8. That money will go toward studying and implementing increased W4 frequency.4uzhoj)
time in service interval(The AC explains the background of engine time in service intervals as well as the Federal Aviation Administration's (FAA) regulatory requirements for time limitations and time in service intervals for ... Alexander Demidov)
