Biggest E-jet – E195AR
maximum no-frills seating 122
range 2200 nm
Smallest CSeries – CS100
maximum no-frills seating 125
range 2200 nm

Differences?
CS100 is more plane than E195AR: MTOW CS100 54,9 t, E195AR 52,3 t.

What is the difference in empty weights, and how does fuel burn differ?

CS100 also takes off, at ISA sea level, in 1500 m – E195AR needs 2200 m.

E-jets go smaller than this (E195 down to 1400 nm of STD, E170 down to 80 seats at no frills and 36 t MTOW STD) CSeries bigger than this (CS100ER and CS300ER up to 2950 nm, CS300ER up to 145 seats no frills and 63,1 t MTOW).

Examining the numbers, D-18T series 5 is far bigger than Series 3.

For one thing, the fan diametre is 233 cm for series 3 – 305 cm for series 5. The exterenal envelope is not only wider and higher around the fan, but longer.

787 and An-148 are two different class of aircraft

Both are twinjets recently entered into service and with small world fleets due to trouble ramping up.

Yes, but A-380 is a quad, thus not subject to ETOPS (except in USA that has none of them). Australia (Qantas) does have LROPS – how about other A380 fleets?

A major threshold is quoted as 0,02 IFSD per 1000 engine flight hours. Rearranging, it gives 1 IFSD per 25 000 plane flight hours.

How many hours has world An-148 fleet flown?
How many hours has B787?

How many “business” seats can fit in CS100?

A318 maximum no frills seating is 132, at 6 abreast meaning 22 rows. BA has 32 seats, 4 abreast, so 8 rows.

CS100 maximum no frills seating is 125, at 5 abreast meaning 25 rows.

E190 maximum no frills seating is 114, at 4 abreast meaning 28 and a half rows.

At all business, E190/Lineage 1000 should fit 10 rows of beds at 3 abreast, 30 total.
CS100 should fit 9 rows of beds. But Cseries cabin is 41 cm narrower than A320.

Can 36 4 abreast beds in Cseries fit for transatlantic, or does it have to be 27 at 3 abreast to qualify as business for you?

How much MTOW can CS100ER lift out of LCY? How much can Lineage 1000?

What is the range of CS100ER out of LCY with 36 beds, baggage and extra tanks as appropriate? And what is the range of Lineage 1000 out of LCY with 30 beds, baggage and extra tanks as appropriate?

Also remember what Odyssey means. 10 planeloads of rich businesspeople should get killed off piecemeal with a lone survivor held as sex slave for 7 years. So expect to hear of the fate of the passengers sometime in 2024 or 2025….

In the Russian original linked, the air show is not called Paris Air Show. At least now.