Yes you have read it right. Now there's a platform called ipassio which allows you to find a teacher who's globally acclaimed and take a demo session to understand the teacher and decide if you want to go ahead with thi teacher or not. If you want to go ahead then pay for each class and learn it online.

The entire process is online and you will be taught either on skype/hamgouts. You will get the previlage to take the course one on one and can ask any queries you have. Also to better your practice you will be assigned home works and good study materials will be provided.

Below are the course links:
https://www.ipassio.com/courses/learning/flute

Better in person. IMO.

Yes i have heard about learning flute online including through apps, sessions, and tutorials etc.

Can we only learn flute or all music instruments?

Actually ipassio is a platform to learn hobbies online. Not only flute, they have other various instrument courses. Have a look on the find course page and request for a free session, where you can meet the teacher and discuss your requirements and understand the course well before you start it.

Here's the course page link https://www.ipassio.com/courses

I have checked your page but i didn't get any option to learn trombone instrument.

I agree that it's much better to learn from a teacher in person.
The flute is an acoustic instrument and the social and aural aspects are best in a "live" setting.