* Actual Number of Domestic Airline Passenger Miles Traveled Over a 30 Month Period;

data airtrvel; /* miles='Passenger Miles (in Thousands) */

month  miles
------------

1      18245

2      17467

3      21822

4      20318

5      20980

6      22019

7      23681

8      25353

9      19671

10     21099

11     19916

12     22174

13     20916

14     21392

15     26688

16     24757

17     25385

18     25330

19     27270

20     28204

21     21585

22     23129

23     21717

24     22993

25     21773

26     22021

27     26641

28     24768

29     25123

30     26225