Looking to go visit at Corpus Christi, I used www.fltplan.com ,
with an artificially long fuel burn time to check out the direct line
route from Altus OK to the Gulf - and I saw a red ring on the sectional
view of the direct line.
It was flagging a Notam good for two or three days in a weeks time - for
an airdrop show. That would have been tough to spot by manual methods...

Brian W