As we have seen in a previous question, the A220 is a re-branded Bombardier CSeries.
The CSeries started flying in 2013. At the time Bombardier's other commercial jet was the CRJ, that started flying in 1999, 14 years prior.
CRJs do have a yoke:
If you look closely, you'll notice that the seats look identical, indicating that Bombardier ...
A red/orange color is typically used to denote flight test instrumentation. Indeed, these windows do contain such instrumentation. Below you can see a similar window on a 747-8I flight test aircraft (note the 7th window from the nose):
And the corresponding inside view:
The aircrafts shown above are test aircraft and the windows are blanked for mounting test instrument. The image below shows the inside of Bombardier C-series test aircraft, which shows the mounting of test equipment.
Image from airwaysnews.com
Also, the screengrab below from this video about C series testing shows the interior of the C series test aircraft ...
This is almost certainly an alignment marking for the passenger boarding bridge (jetway). You can find the same markings on other Delta aircraft as well:
(image sources: A320, B737, B767)
The dead giveaway is that these markers are found on the second door on the long haul jets, which are typically boarded through this door instead of the first one:
Cockpit windows that sit flush with the fuselage can save a very small amount of drag, but they require large double curvature window panes. Manufacturing such panes is significantly more expensive and there was limited commercial availability for that product when the A320 was being designed.
You can see a few more examples of flat vs curved windows here: ...
It's important to understand that Bombardier Transportation/Aerospace, while ostensibly a company separate from the original Bombardier family (which only retained a minority stake when it was split off from Consumer Products - snowmobiles, watercraft, etc), is still actually controlled by the family due to a bizarre dual class share structure where the ...
The reason they are selling aircraft manufacturing lines to improve profit margin is because their aircraft business has a relatively low-profit margin. One of Bombardier most successful products is this:
Bombardier Zefiro. Source: Bombardier
It looks somewhat like an aircraft but it is missing the wings. It is called a "train".
Bombardier calls itself "...
That's one of the two ice detectors manufactured by Collins. Below is not precisely the model used by A220, but serves to illustrate the general layout of the unit:
Image ref: Collins
From this Collins fact sheet, ice detectors
use a magnetostrictive technology to drive the sensing probe to resonate at its natural frequency. As ice accretes on the ...