Mott MacDonald has provided consulting services to Heathrow Airport for over 20 years, helping to optimize capacity, identify innovative solutions for expansion, and renew assets. The document discusses several projects Mott MacDonald has undertaken for Heathrow, including developing masterplans for a two-runway and three-runway expansion, studies on baggage connectivity and the tracked transit system, and producing a 30-year land use plan. Quotes from Heathrow representatives commend Mott MacDonald's contributions and the value they have added.