pre_text: table of contents other areas in which we do business . depending on the scope of such regulation , certain of our facilities and operations , or the operations of our suppliers , may be subject to additional operating and other permit requirements , potentially resulting in increased operating costs . future regulatory developments future regulatory developments and actions could affect operations and increase operating costs for the airline industry , including our airline subsidiaries . see part i , item 1a . risk factors 2013 201cif we are unable to obtain and maintain adequate facilities and infrastructure throughout our system and , at some airports , adequate slots , we may be unable to operate our existing flight schedule and to expand or change our route network in the future , which may have a material adverse impact on our operations , 201d 201cour business is subject to extensive government regulation , which may result in increases in our costs , disruptions to our operations , limits on our operating flexibility , reductions in the demand for air travel , and competitive disadvantages 201d and 201cwe are subject to many forms of environmental regulation and may incur substantial costs as a result 201d for additional information . employees and labor relations the airline business is labor intensive . in 2015 , salaries , wages and benefits were our largest expenses and represented approximately 31% ( 31 % ) of our operating expenses . the table below presents our approximate number of active full-time equivalent employees as of december 31 , 2015 . mainline operations wholly-owned regional carriers total .
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table: Mainline  Operations Wholly-owned  Regional Carriers Total
table: Pilots and Flight Crew Training Instructors 13,100 3,200 16,300
table: Flight Attendants 24,100 1,900 26,000
table: Maintenance personnel 14,400 1,800 16,200
table: Fleet Service personnel 16,100 3,200 19,300
table: Passenger Service personnel 16,500 7,100 23,600
table: Administrative and other 14,700 2,400 17,100
table: Total 98,900 19,600 118,500
question: Analyse this data from a financial earnings document. what is the percent of the mainline operations full-time equivalent employees to the total number of full-time equivalent employees