Willie Walsh, IAG's chief executive, said: " We have seen a substantial decline in bookings across our airlines and global network over the past few weeks and we expect demand to remain weak until well into the summer. We are therefore making significant reductions to our flying schedules. We will continue to monitor demand levels and we have the flexibility to make further cuts if necessary. We are also taking actions to reduce operating expenses and improve cash flow at each of our airlines. IAG is resilient with a strong balance sheet and substantial cash liquidity. "