Paizo designer Sean K. Reynolds designed some completely unofficial variants of the fly spell on his personal website. Yes, these are COMPLETELY unofficial.
Here are three variants of the fly spell from different schools. Each of them has a weakness, drawback, or some other element that makes them less effective or powerful than the transmutation form of the spell), but they’re still viable options for thematic spellcasters or specialist wizards who chose transmutation as a prohibited school.
This spell functions like fly, except that rather than being sustained by magic, you conjure a Small flying outsider that carries the target and follows his mental commands.
The outsider has hit dice (d8s) equal to half your caster level and 4 hit points per hit die. The outsider is a separate creatures for the purpose of all effects (such as targeted and area effects). It uses the target creature’s saving throw bonuses and has improved evasion. It is subject to all effects that target outsiders (such as magic circle spells, which prevent it from entering or carrying the target into that area). If the outsider is killed, the spell ends (carrying the target safely to the ground as explained in the fly spell).
When you use a summoning spell to summon an air, chaotic, earth, evil, fire, good, lawful, or water creature, it is a spell of that type. When you summon the creature, you decide if it is a celestial (angel, avoral, or guardinal), fiend (daemon, demon, or devil), or elemental (air or fire); this choice has no effect on the creature’s abilities (though if you have an ability that augments or extends spells you cast that summon certain creatures it has the normal effect).
The focus is a tiny bag and a small (not necessarily lit) candle.
I cannot wrap my head around what the bit in bold means, could someone please explain it to me in another way
When you use his spell you summon an outsider to carry you. You choose which type of outsider when you cast the spell, and this changes the type of the spell to [air] if you summoned an air elemental, [chaotic, evil] if you summoned a demon etc. This may interact with abilities you have which give you +1 caster level with [air] spells, for example.
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Besides that, their type and alignment can change how they react to specific spells.
I don't see anything about the creature AC, but they can be targeted by spells (and I hope by weapons, too).
It says that the outsider follows the caster mental commands, but not that it is friendly, so summoning something that has problems with your alignment or nature can have it trying to subvert those orders.
The bolded text has the same general idea as the text accompanying summon monster--the thing you choose to summon affects the metaphysical properties (i.e., descriptors) of both the spell and the creature, but no matter what you pick the creature is basically the same apart from said descriptors. If, for example, the caster chooses to summon a devil for flying, the spell is [evil, lawful] and the devil is of the evil and lawful subtypes, so smite evil would wreck the outsider, protection from evil would repel it, good clerics that somehow got access to this spell would be unable to cast it in this manner, and so on. The summoned devil would not, however, have the usual abilities specific only to devils, though, so it wouldn't get energy immunity/resistance or whatever.