Point-to-point mileage calculator?

Subscribe
With the demise of UACNXN software where can I find a similar resource for true point-to-point mileage calculations for UA flights? I have an upcoming mileage run with the return leg being TPA-IAD-PDX, which as UA sums it, is 3137 miles and would require 7 500-miler UG certs. My guess is that it be 6 certs if the mileage were calculated point to point.
http://www.webflyer.com/milemarker/milemarker.htm
I use Continental's calculator, and it's been very accurate to MP's measurements for me.

http://onepass.continental.com/asp_u...calculator.asp

------------------
Who is John Galt?
------------------
TPA-PDX comes to 2490 miles, which would be 5x 500milers.

http://gc.kls2.com/cgi-bin/gc?PATH=t...OR=&MAP-STYLE=

gives 2496 miles, which is still 5x 500 miles by a skinny hair.
Thanks, guys. This is most helpful ...

...ess