Virgin Australia drops after trading ex-dividend

** Shares of Virgin Australia VGN.AX fall as much as 3.4% to A$2.705, their lowest level since August 28

** Air carrier trades ex-dividend; had declared an FY fully franked dividend of 7.6 AU cents apiece

** Stock down 5% for the week, headed for its worst week in nearly a month

** YTD, VGN down 22.3% vs 14% fall in Qantas QAN.AX