I'm new to cruising and trip insurance, so I'm hoping someone can help. Please be nice!

I've asked about "missed connection" coverage on two insurance websites, and I'm not getting the answers I'm looking for.. so I came here! Here goes: Every "missed connection" coverage I'm reading says: "Missed Connection - The Insurer will reimburse ...if Inclement Weather or Common Carrier causes cancellation or a delay of all regularly scheduled airline flights for three to less than five hours to your point of departure."
What does "All regularly scheduled airline flights" mean? Say our early morning American Airlines flight is delayed for 3 to 5 hours, will the insurance reimburse the cost of catching another flight, regardless of carrier? OR do all airlines have to be delayed for 3 to 5 hours before they'll pay for us to meet the ship? I don't want to have to pay a change fee or pay for another ticket with Delta or SW because my American flight was delayed. Does that make sense?
I'm so very confused, and the more I ask the agents the more confused I get. Has anyone had to purchase insurance like this because they were flying down the day of the cruise? We're trying to make it down there the day before, but we may have to fly down the day of because of work.

If you were in a similiar situation, can you recommend a particular insurance company/policy that you knew would cover you? Thanks for your help (and for reading my post if you made it this far!)