On The Fly: Analyst Upgrade Summary Today's noteworthy upgrades include: Aeropostale (ARO) upgraded to Outperform from Market Perform at BMO Capital... Gap (GPS) upgraded to Buy from Neutral at Citigroup... PS Business Parks (PSB) upgraded to Market Perform from Underperform at BMO Capital... Redwood Trust (RWT) upgraded to Outperform from Market Perform at FBR Capital... Regal-Beloit (RBC) upgraded to Outperform from Neutral at Credit Suisse... Unilever (UN) upgraded to Buy from Reduce at Nomura... Prudential (PRU) upgraded to Buy from Hold at Argus... Inergy, L.P. (NRGY) upgraded to Overweight from Neutral at JPMorgan... Noble Energy (NBL) upgraded to Buy from Hold at Stifel... Halcon Resources (HK) upgraded to Buy from Hold at Stifel.