** Shares of Alliance Aviation Services AQZ.AX fall 15.6% to A$0.76, their lowest since May 2017
** Aviation services provider reports HY loss attributable of A$105.8 million ($74.4 million) vs profit of A$28.9 million a year earlier
** Stock on track for worst day since November 7
** About 1.6 mln shares change hands, 5.5x the 30-day average of 285,203
** Stock down 38.9% YTD, including current losses
($1 = 1.4223 Australian dollars)
(Reporting by Jasmeen Ara Shaikh in Bengaluru)
((Jasmeenaraislam.Shaikh@thomsonreuters.com;))