I'm not so sure we'll see anything significant. There should be room for Jazz to reallocate some DH4 flying to CR9/E75, and for AC to reallocate routes between Jazz/Mainline/Rouge.

I did a very rough estimate of how the current DH4 fleet is allocated:

• West: 18
• Billy Bishop: 7
• Ontario/Quebec: 7
• East: 7 (All PAL)
• Parked 4 (Jazz - likely never to return)

Combined AC Express will shed a net 6 DH4 FINs in 2026, but Jazz is dropping 11 (5 of which go to PAL). The remaining 25 Jazz FINs will get their cabin refresh/WiFi.
Unless current utilization is low, they'll need to allocate, say... 5(?) more DH4s for the YTZ expansion.

Speculation 1 - fleet shuffling:

1. Jazz moves 5 FINs from Ontario/Quebec regional to YTZ, and another 5 FINs to PAL
2. PAL picks up much of Jazz's Ontario/Quebec flying
3. AC tweaks the YTZ/YYZ transborder flying, allowing Jazz to reallocate a some CR9/E75 hours to Ontario/Quebec regional.
4. In the West:
   1. Some Jazz CR9 transborder will go to mainline A220s (21 deliveries in next 15 months) and Rouge 7M8s (this has already started)
   2. Some YVR to Portland, Kelowna, Fort St. John, Prince George can go from DH4 to CR9s. (CR9 has operated plenty of YVR to YYJ and SEA this year already)

Speculation 2 - new DH4 allocation:

• West: 13 (Refurbished Jazz)
• Billy Bishop: 12 (Refurbished Jazz)
• Ontario/Quebec: 5 (PAL)
• East: 7 (PAL)

I read that the extreme cold temperatures reduces their range, so perhaps we'll see most of the ES-30s in BC.

Stated range in hybrid mode is 800kms with 25 pax, so easily YVR to Victoria, Nanaimo, Comox, (Long Beach?), Kelowna, Kamloops, Seattle, Portland.