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On Flyby Attack,
Flyby Attack is from the Bestiary, and it states this in additional resources on feats from the Bestiary
Feats: none of the feats are legal for play for PCs, animal companions, or familiars unless specifically granted by another legal source.
I don't see anything in the summoner class that grants any feats from the Bestiaries.
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Yes. Most of the following feats apply specifically to monsters, although some player characters might qualify for them (particularly Craft Construct). Link
With ride-by attack the rider gets to make the attack, not the mount. For your mount to get an attack as you ride-by the mount would need the spring attack feat (which requires the dodge and mobility feats).
To make a ride-by attack you must charge.
When you are mounted and use the charge action, you may move and attack as if with a standard charge and then move again (continuing the straight line of the charge). Your total movement for the round can't exceed double your mounted speed. You and your mount do not provoke an attack of opportunity from the opponent that you attack.
However, flyby attack states that When flying, the creature can take a move action and another standard action at any point during the move. The creature cannot take a second move action during a round when it makes a flyby attack. Per the charge rules you may still charge but can only move up to your mount's speed (not double like a normal charge since a charge is a full round action)if you only have a standard action. My thought is that you can make a charging flyby attack but I'm not sure. Someone else may be able to clarify this point.
Remember that a lance has reach, so you will attack before your mount (although on the same action). This is important because if your mount pounces (1 evolution point, quad), your action would go like this: charge, rider attacks w/ lance at 10', mount engages and gets all its attacks (so when two dragons tangle in the air) or charge, rider's single attack w/ lance at 10', mounts single attack, continue move (aerial jousting).
Also note that RAW does not say anything about flyby attacks negating AOO, unlike ride-by attack and spring attack. So your opponent will get an AOO if you flyby attack (as it should be if jousting anyway).
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Precedent for how another legal source allows a Bestiary feat, is that the Bestiary feat is specifically called out as legal in the other source.
(e.g. Core Rule Book lists the Bestiary feats in the Animal Companion write-up, and Ultimate Combat calls out specific Bestiary feats that are allowed for Rangers with the Natural Weapon fighting style)
Just saying that an Eidolon can take whatever feats they qualify for, is not a legal source for using Bestiary feats. There would have to be some legal source that specifically said that Eidolons could take Bestiary feats or specifically called out the specific Bestiary feats.
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Re-reading this thread, flyby attack is not allowed because feats are not allowed from the bestiary for Pathfinder Society play (as Dragnmoon originally pointed out). However, if you take ride-by attack and your eidolon takes spring attack (which requires dodge and mobility) you would be able to do it. To me it seems like a lot of feats to give your eidolon a single attack during your ride-by.