Because date and times are same and prayers were already offered therefore no need to pray again.
While on a 14 hour flight going from east to west, we started the flight at night and arrived at our destination at night, with the date not changing. During these 14 hours, fair and Zohra in time did not seem to appear. What is the ruling Re the fajr and zohr in these circumstances?
The Namaz time will be in accordance with the time zone you are passing through at the time.
Usually on the plane they tell you what country you are going over and what the time is there. Therefore the time of Fajr and Zohr can be ascertained.