I was disappointed when I looked up the amount of weeks that Delta has made available during the summer months. Every third week during the summer has a very low number which prevents taking more than two weeks of vacation in that month. One week in July has only 13 days, which means only the top 13 A320 Capts can expect to be awarded more than two weeks of vacation during July. 13 out of 265 pilots is a very low number. More even distribution of vacation should be issued. Delta is forcing us to take a majority of our vacation outside of the summer weeks. One of the most important reasons to stay senior on an a/c has been taken away!