Stop heading using multiple lines

In the table view of aircraft, the heading was displayed as "330 (NW)"
or similar. However, this cause the entry to scroll over into two lines
of text, and reduces the number of planes that can be seen in the table
at any one time.

There probably should be a way to make the table view wider by scrolling
it, but I can't see any way to do that. So for the moment I've commented
out the extra (NW) bit.