I hold a multi-entry Schengen visa. Would the airline let me board a Schengen-bound flight if my return flight is on a different airline?

Question

Ok, worried by this question, my situation is:

1. Have valid multiple entry Schengen visa, first trip already made to issuing country.
2. DOH-ORY one way ticket with Pegasus, with 3 hour stay at SAW, so entry into Schengen at Paris. Stay for 5 days.
3. CDG-IST direct one way ticket with Atlas Global, Have Turkish tourist visa. Stay for 5 days. So, Exit from Schengen at Paris again.
4. SAW-DOH direct one way with again Pegasus airlines.
5. Nationality Indian, Residency Qatar, Schengen Visa by embassy in Qatar.

Can/will check-in desk agent at Doha object for my boarding detailed in point 2 (& Atlas G agent at CDG for Turkey in point 3)? I have all required hotel bookings for Paris and Istanbul. Any Timatic or other official quotations will be appreciated.

Can we enter Schengen (and/or Turkey) by two one-way tickets on different airlines?

On mobile, so T.SE did not offer me similar questions, but will search around

Answer 1

Can we enter Schengen (and/or Turkey) by two one-way tickets on different airlines?

Yes you can enter with a one way ticket in Schengen or turkey on different airlines. I have entered multiple times in Schengen, UK and Turkey with one-way ticket. Your all airline tickets can be with different airlines as long as you provide your next/return ticket to airline counter or immigration when entering into Schengen/Turkey.

Recently this year I flew through Etihad Airways with 1 ticket from:

24 Feb: KHI TO ABU DHABI

24 Feb: Abu Dhabi to Rome (Schengen 10 hours layover which I entered and exit)

24 Feb: Rome to LHR

All the time I was asked for my return ticket at airport in KHI also at immigration in Rome and London. Simply I provided my return ticket from Pegasus airline from London to Istanbul with different airline and never faced any problem.

This was my return flight Pegasus airline from London Gatwick to SAW:

So shortly neither airline nor immigration has any issues regarding different booking as long as you provide your complete flight tickets/boarding passes for your entire journey. Also there is no such rule that you must use the same airline for your return journey.