11.  The accidents were due to old planes and too few pilot training hours.

12.  Thai has been attempting to restructure its fleet by selling off old planes and buying new ones.

13.  Those accidents were due to malfunctioning old planes or lack of pilot training.

14.  Lacking financial means, they generally fly old planes purchased or leased from the ex-Soviet Aeroflot company under hazardous conditions by Western standards.