For September, American Airlines parent company AMR (NASDAQOTH:AAMRQ) saw modest increases in its key metrics. The company has released its figures for the month and, for the most part, they're slightly higher on a year-over-year basis. Revenue passenger miles crept up by 1.3% over September 2012's number to hit 10.9 billion. Available seat miles inched up a little more, growing by 1.9% across that period to 13.5 billion.

The total number of boarded passengers also advanced, increasing 1.4% on a year-over-year basis to just more than 8.4 million. However, AMR's load factor (i.e., the average "occupancy" of its planes) was 80.7% last month, a drop from the 81.1% of September 2012.

Fool contributor Eric Volkman has no position in AMR, and neither does The Motley Fool. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.