TAC Air Purchases Operations in Utah by Luke Jones Posted 5/16/2012 10:52 am Updated 6 years ago Truman Arnold Cos. Of Texarkana acquires Keystone Aviation LLC of Salt Lake City and will expand its TAC Air brand to two Keystone operations in Utah. Want the Full Article? Get Unlimited Archive Access for $19.95 per Year Readers must pay to access articles older than 15 days. Articles newer than 15 days are not included in this offer. Purchase Now Already have archive access? Login to view this article.