Many airlines apply common sense and respect their customers, which turns out to also be a good business strategy for them. UNITED/CONTINENTAL APPARENTLY DOES NOT.
Passengers on all flights originating from European soil (no matter their citizenship) are protected from irresponsible airline behavior since 2004 through 
European Regulation 261/2004, requiring a €600 compensation payable to each passenger on a long-haul flight delayed for more than 4 hours. Airlines, irrespective of their home base country, are also required to inform passengers of their rights under this law while the delay happens.
Below some accounts of problems unrelated to the initial flight which were encountered by passengers of UA/CO132 on their respective connecting flights and their return flights. 
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Below the account of the return flight of one of our fellow United 132 passengers:
I flew back from Paris to Dulles on January 3 on United/Continental  flight 133 departing from Paris at 5 pm. Once inside the plane, we were  told that there would be a stop in Gander, Newfoundland, to refuel, and  that we would arrive at 9 pm. According to the PA this was due to bad  weather. From a conversation with my neighbor on CO flight 132 on Dec.  22, however, I knew that this happens very often on United flights from  Paris to Dulles: the planes are very small and cannot carry enough fuel  to cross the Atlantic without stopping for refueling. On the Charles the  Gaulle web site, the scheduled arrival time was 6.15 pm, which  corresponds to the normal travel time for a direct flight from Paris to  Dulles. On my United ticket, the scheduled arrival time was 8.15 pm,  meaning that United knew, months in advance, that the plane would stop  for refueling on the way. Of course when they sell the tickets they  don't mention this stop, and the flight is sold as a direct flight. The  crew told us they did not know about the stop before boarding the plane,  which cannot be true.
Upon arrival, we waited for 15 minutes for  United agents to arrive before we could exit the plane. This additional  delay caused passengers in transit to miss their connecting flights and  be stuck in Dulles for the night. The captain apologized for this, and  said he hoped passengers would complain to Mr. Smisek, CEO of United,  "responsible for the merger with Continental that causes all these  problems."
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Another United 132 passenger about the return flight:
The same thing happened to me on my return flight from Paris to Dulles.   We refueled in Boston and I missed my connecting flight in Dulles to  Denver and had to once again stay in DC and take a flight the next day.
I was delayed an additional 12 hours because of that delay. We arrived  in DC at 12:30am and once again I was shipping off to hotels in the DC  area.  I slept from 2:30am to 5:30am to then return to the airport AND  my flight the next day was delayed an hour due to mechanical issues.