Dollar Tree's (DLTR) earnings fell short of Wall Street estimates on Thursday, sending the stock down in morning trading. The dollar store chain is awaiting regulatory approval on its deal to buy Family Dollar stores. The retailer plans to sell around 330 Family Dollar stores in order to get the green light for its $8.5 billion takeover plan from the Federal Trade Commission. Dollar Tree, headquartered in Chesapeake, Virginia, posted earnings of $0.71 per share, coming in below analysts' estimates of $0.74 per share. The company reported $0.67 in the same period last year. First quarter revenue was up on last year's numbers at $2.18 billion but also missed Wall Street predictions of $2.20 billion. The combined force of Dollar Tree and Family Dollar, which is headquartered in Matthews, North Carolina, would create the largest dollar store company in the U.S. with over 13,000 stores.