Analysts are putting out their estimates on fourth-quarter sales for the Motorola Droid, and it looks like it just might hit the 1 million mark.

According to one analyst firm’s assessment, sales of the Motorola Droid are “doing great.” In a report today, Avian Securities projects 1.25 million Motorola Android shipments in the fourth quarter, above Street estimates, noting the Droid is launching internationally as the Milestone in certain regions. Equity analyst Mark Sue of RBC Capital Markets also expects the 1 million mark is achievable for the fourth quarter with its exclusive U.S. carrier, Verizon Wireless.

Avian’s Avi Cohen points out there appear to be no shortages of the Droid and the first generation of the Research In Motion (RIM) Storm last year hit 1 million sell-through at Verizon Wireless within two months despite it being one to two weeks out of stock.

Of course, Motorola’s rise comes as RIM is losing share, with the Storm 2 being “mildly disappointing,” according to the Avian report based on a U.S. retail store survey.

A report circulating yesterday from Oppenheimer analyst Ittai Kidron said shipments of the Droid are meeting expectations of 900,000 shipped in the quarter, but the Cliq is falling behind due to battery life problems. Still, Avian says the Cliq is seeing good traction as a Top 3 device at T-Mobile.

According to Avian, the Palm Pre is outselling the Pixi, and the Pre is neck-and-neck with the HTC Hero, RIM Curve and Samsung Moment as top devices at Sprint. The firm expects the Pre and Pixi will be at Verizon in early 2010.

At Verizon stores, the Droid is the top-selling device, outpacing RIM’s Storm, Tour and Curve and HTC’s Eris, according to Avian.