On error output NA rather than character "NA" which it did previously, helps if you later want to test is.na()
small explanation text
Deleted line
Not final - Testing and cleaning
Changed data being mapped
Added routine to keep trying 10 times if 'flight.info' fails. Trying to make more robust.
Also deleted old testing code
Some new graphs
Add database connection close command
changed DB table input and added close connections to database at end
Added odbcClose
Removed odbcCloseAll - apparently slowling down
A couple of small things