Airlines take advantage of strong markets to refinance debt.

  United and JetBlue have both taken the opportunity in the first quarter to refinance old debt and secure new lines of credit, while Air Canada has closed its long-touted EETC earlier this week. Earlier in the quarter both American Airlines and US Airways issued their own EETCs and more are expected in the coming months as airlines take advantage of the strong market to finance aircraft more cheaply.   All of these deals are analysed in detail in the forthcoming issue of Airline Economics, along with a detailed look at the health and prospects of the regional airlines market