<font face="Verdana, Arial, Helvetica" size="2">As the peak summer flying season arrives, major domestic U.S. carriers are spending millions of dollars reconfiguring overhead bins so you can park ever-more luggage, especially the ever-popular wheeled variety.

The move, though, is a bone of contention for flight attendants, who are concerned about the dangers of handling increasingly heavy baggage and insist on the need for weight limitations.</font>