Airlines are looking for various skills and they're all fairly obvious: responsible, diligent, determined, gregarious, team oriented, motivated, etc etc. You're job is to figure out which qualities most apply to you and set about weaving examples into your answers which demonstrate that you have these qualities.
Many airlines now ask the standard nonsense questions which usually begin with the words, 'give us an example of when...' and then score you on your answer using a matrix. It's complete nonsense, but dreaming up examples which demonstrate that you have one or more of the usual qualities is your key to success.
Interview coaching could be the shrewdest investment you will ever make; I know because it worked miracles for me.