Case 1: First of all, it will depend on whether you are replying to a question from the lady. If so, phrase the answer in the same terms of her question. For example, if she asked "What time are we landing?", you should reply "We are landing at ...etc". If she asked "What time does the flight land?", then answer using that form. Also, it would be more natural to say "will be landing.." instead of "is" and "are". IF she hasn't actually asked the question, then either form will be suitable.
Case 2: "My flight will land [or "be landing"] at 9 in the morning".
Student or Learner