Lots of 711s to LAS
, 1776s to PHL
, and 1492s to CMH
. Also a disproportionate number of 8s (in various configurations) in and out of HKG
. Check the recent thread about "flight 1" for various airline's flight 1s. Some airlines assign certain series of numbers to certain geographical regions, others are just random. It used to be more common for flight numbers to reflect equipment (e.g., 600-699 is a DC-9, 700-799 is a DC-10, etc.), but I don't see that much anymore other than mainline jets are usually lower numbers than RJs and props.
Common sense is not so common. -Voltaire