Altimeter: fix typo

Refer a pilot friend or colleague to sign up for an annual subscription on our application using your unique referral code and both of you will profit from it!

To show our appreciation for your support, we will extend your subscription free of charge for two additional months and your friend will get a reduced price on the subscription of his choice. With this new referral program we want to reward our loyal customers who recommend us and help us grow our community.

Don't wait any longer to share the benefits with your pilot network!