Mr Cook, who has offered to pay a "substantial" sum of money to buy the runway and surrounding facilities, said the international business community looked on Sheffield's lack of an airport with "universal incredulity".

BBC: Sheffield City Airport

With interest rates so low, it makes sense for Apple to borrow a large sum of money rather than pay a big tax bill.

NPR: Apple Sells $17 Billion In Bonds In Record Deal

Of course, lenders are quick to point out that escrows are not actually a cost since they are just establishing the escrow reserves to pay your taxes and insurance, but it is a sum of money above and beyond the principal balance of the mortgage you are refinancing and it has to be funded by somebody!

FORBES: The No-Cost Refinancing Myth

The South Wales Central AM argued that investing a modest sum of money to attract new airlines would have a significant pay back to the economy in Wales.

BBC: First minister's questions