Just to clarify ... "
DCL insurance" -- or better worded as the "travel insurance offered through DCL" -- is a business contract you made with a 3rd party vendor and not directly from DCL. It has always been clear that it only covers those portions of your travel that are purchased directly through DCL (which for most cruises is simply the cruise, maybe ground transfers, most don't purchase airfare through DCL). So, no, they will not and should not have direct access to DCL's records. And if one didn't purchase airfare through DCL, it is most likely a goodwill gesture to offer
any reimbursement for flights to be rescheduled because the insurance company has nothing to do with DCL directly and is not at all connected to the mechanical issue that impacted travelers. You are asking one company to pay for something they had absolutely no connection with, no control over, and did not charge a premium for covering that portion of your trip. It's akin to asking your neighbor to reimburse you because the neighbor recommended DCL as a good vacation for your family.
I understand that some cruisers may have had airline change fees either waived (by the airline) or paid (by DCL). I understand the desire to be made whole for an unexpected expense. You may have better luck asking DCL to cover such a fee rather than the insurance. And as someone else pointed out, reimbursement and coverage for trip interruption/delay can vary depending on the length of that delay.
I'm sympathetic to those who had travel plans disrupted, especially huge airline change fees. I certainly would not be happy, but I'd also be very upset with myself for bypassing trip insurance that included my flights. I'd consider it a very expensive lesson learned, and purchase insurance that covers all aspects of my travel expenses in the future. Goodwill gestures are nice, but should never be counted on.
Best of luck to those submitting insurance claims. No matter the situation (travel, medical, auto accident, home repair, etc.) -- claims can take quite a bit of time and effort.