Heathrow has announced the longlist of 37 companies progressing to the next round in its search for expansion Innovation Partners. Successful entrants will now have eight weeks to bring to life business cases ready to pitch to the airport’s top executives, ensuring the most efficient, sustainable and affordable plan is delivered. Heathrow has announced the longlist of 37 companies progressing to the next round in its search for expansion Innovation Partners. Successful entrants will now have eight weeks to bring to life business cases ready to pitch to the airport’s top executives, ensuring the most efficient, sustainable and affordable plan is delivered.