bmi diamond club - Is a change of aircraft considered change of schedule?

So I get a push message from my flights app informing me of a change to an upcoming VIE-TLV redemption flight on OS, and seems that the aircraft has changed from a 763 which has a proper L/H J product, to an A321 configured with a S/H J product (basically same seats as economy etc).

Obviously I'm not happy about it and I'm wondering before I call the ICC to cancel my booking, do you recon I can claim this is an involuntary change of schedule and therefore no cancelations fees should be charged?

After all, it's not the product I originally booked...

I had a similar scenario a couple of years ago, JNB-CPT on SAA, where the virtually hourly shuttle service has a few A340 operated flights. My A340 flight was changed to B737/A320. I was able to negotiate a free change back onto the A340 operated service, which was now running an hour earlier than the original plan. I can't recall if this required a couple of calls or went through first time, but as always, if at first you don't succeed .....

I don't believe it is considered a change of schedule, as the flight is still presumably running from point A to point B on the same timings.

From a practical perspective, you are paying for a flight in a particular cabin, not on a particular type of plane or product. In a situation like JeffBHD had, there is an amount of flexibility to at least swap, plus the ICC was able to be a bit more flexible back then. In this case though, you are still getting your flight and cabin of booking, so it isn't an involuntary change.

Also if OS are changing planes, there is still a chance that they will change back between now and your flight anyway. I can understand why you are bothered by this though, as it is a downgrade in terms of seating and comfort. Personally I'd just take the cancellation fee on the chin if changing to another carrier is your preferred option rather than waiting to see what turns up for the 3 hour 25 minute flight.

Cheers guys.

I'll try my luck and see what happens, but not going to make a big issue out of it so if they insist, and I'll just take the change fee on the chin as RAPC suggests.