British Airways cabin crew met MPs on Tuesday - the penultimate day of the last of a series of five-day walkouts.
They have told MPs how the airline is currently gripped by a "climate of fear".
On Monday, BA boss Willie Walsh said he would hold out against the striking cabin crew "for as long it takes".
"I don't think we've been brave enough in the past to stand up and say 'no'," he said at a conference in Germany.
Mr Walsh said the airline would continue to focus on building up the number of flights it runs during the strike.
BA cabin crew are entering their 21st day of strike action this year, with the latest five-day action due to end on Wednesday.
The Unite union, which represents the striking crew, has threatened to hold a fresh ballot among its members on further strike action, which could disrupt flights during the summer.
The long-running dispute is over pay, staffing levels and working conditions.