An air inlet for an engine of an aircraft, the air inlet having a duct feeding outside air to said engine together with a filter system combining at least one filter and at least one bypass device. The unique code is in close association with vendor information, such that the unique code will be output during normal playback of the information on the recorded media. The well-dispersed or in situ metal sulfide catalyst particles catalyze beneficial upgrading reactions between the heavy oil and hydrogen and eliminates or reduces formation of coke precursors and sediment.