Need Help!!

[Willit Run]

I know I posted these shots already but, I need some help to I.D. the aircraft in the shots.
They are all U S Airways and I have an idea what they are but not 100%.

Can you help?

Thank you, Cory

[ThatOnePerson]

The winglets would give away the 2nd as a 737-700 or 8-9 (but it doesn't look long enough) I think, 3rd is most likely a -300 or -400. Not sure about the first.

[Slotback]

First is in the Embraer 145 family, though, I am unsure on the exact model (Isn't an LR though,they have winglets).

[Aerophile]

First is in the Embraer 145 family, though, I am unsure on the exact model (Isn't an LR though,they have winglets).

Either a 135 or a 145.  It's hard to tell.  The engines give it away as an ERJ though.  I know it's not an XR.  ExpressJet is the only company that operates the XR.  The one departing on the left side of the photo appears to be a 767.