Looking on the internet deeply has found these results:

are you on line is the most popular phrase on the web.

are you in line 11,060,000 results on the web	are you on line 15,610,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
What you are advocating is in line with the motto of the European Year of Intercultural Dialogue, 'Together in Diversity'. Are you sneaking in line with a tasteless inflatables? They traced the inheritance through to your father, but his having passed Even if you are next in line. You are right in line with your own destiny. If that is the case you are next in line for her departed father's fortune. my condolences we will not find any solution you are in line	It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

are you in line

11,060,000 results on the web

are you on line

15,610,000 results on the web

More popular!

What you are advocating is in line with the motto of the European Year of Intercultural Dialogue, 'Together in Diversity'.
Are you sneaking in line with a tasteless inflatables?
They traced the inheritance through to your father, but his having passed
Even if you are next in line.
You are right in line with your own destiny.
If that is the case you are next in line for her departed father's fortune.
my condolences
we will not find any solution you are in line

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.