Yes, you can fly and book this segment for July 2010. Just check aa.com, EF, or other search engine for schedules. When checking make sure you change your departure date to July, because if you leave it April nothing will show up for AA. Flight number is AA 278 departs DFW 3 PM and arrives ANC 7 PM.

As previously mentioned, these are seasonal flights so if you are actually planning for summer 2011, then the AA ANC schedules won't be released until October/November of 2010. If you are booking a xCIRn or xONEn prior to their release then you need to book open dated segments for segments whose schedules have not yet been released. This is NOT the case if you are wanting to travel DFW-ANC this summer as schedules have been released for summer 2010.