Irish 'flag carrier' (this term his been disputed) Aer Lingus has recieved, and promptly rejected, a $1.9 billion (£1 billion) takeover offer from low-cost archrival Ryanair. The reason? The bid "significantly undervalues the group's businesses and attractive long term growth potential", according to the Aer Lingus board. Of course, the real reason could be that Aer Lingus, which has a rich history as a full-service, international airline, doesn't want to be bought out by Ryanair, which has gone from being a dowdy puddlejumper of an airline to...