Alrighty, I see WxTechs Mod using 14 Files from Airfield Mod.
Your Vas Mod, since you wanna use it, might be using up WxTech Files too, but it's sth.
to be put before. Test it, if you think it's not good, put it after WxTechs Mod, conveniently.
There's options and your decision, how you want it.
You want Flares and Birds/Smoke, now look how it affects WxTech's Mod, but also
have an eye on the other too. Is a bit complicated at Mods eating up each other's ressources.
But you have no choice.
Putting Vas Mod behind WxTech will affect that Mods (Vas) Smoke to be replaced by WxTechs.
Keep such things in mind. Stuff that loads first, will show up as such.
If you put it behind in Hierarchy, it's useless, unless for the Birds, not inside WxTech Mod.
Try renaming your 3 mentioned Mods to appear in the following order in your Mods folder.
1.Realistic Airfield Lighting v1.51a (let this load first)
2.vas_bird+smokes (to be tested)
3.WxTech_Effects_v1.5_ALL-game-versions (to be tested)
Here is an example of renaming that forces hierarchy to let load the other Mods before WxTechs Mod.
!0_Realistic Airfield Lighting v1.5a
!0_vas_bird+smokes
!0_WxTech_Effects_v1.5_ALL-game-versions
Hope this explains stuff and gives you sth. to tinker up working Flares.
Best wishes
Tobias