To determine how many more people can board the airplane that can seat up to 149 passengers, we can set up the inequality based on the current number of passengers (96) and the maximum seating capacity (149).
Let \( x \) be the number of additional passengers that can board.
The total number of passengers if \( x \) more people board would be \( 96 + x \). We want this total to be less than or equal to 149:
\[ 96 + x \leq 149 \]
Thus, the correct inequality is:
96 + x ≤ 149
So the answer is: 96 + x ≤ 149.