I worked as an intern for CO for a while and we couldn't jumpseat so I got pretty handy on different routes. Communting from IAH to EWR has alot of options. If you have to two-leg it, when going from IAH to EWR, DCA can be a good connection. Out of IAH there were about 5 or 6 fights but once you get to DCA, there are flights just about every hour. Going in the other direction, MSY and DFW are good choices. Same as DCA, flights just about every hour to IAH. I found non-reving between hubs on CO was the hardest just because many crews and non-revers travel. Good Luck!