1.   Because of the fog, our plane had to land at Luton.

2.   Each plane has to follow a precise route.

3.   That cargo plane of yours has a range of three thousand, six hundred sea miles.

4.   The patrol plane has an infrared capability, so that searches can be made in the dark.

5.   The plane had to change course to avoid the storm.

6.   The plane had to deviate from its normal flight path.

7.   The plane had to make a forced landing in a field.

8.   The plane had to make an emergency landing because of mechanical problems.

9.   To add to their misery, the flight was delayed when the plane had to land at Belfast because of bad weather.

10.   The plane had to make an emergency landing.