Its called relative speed. 700 miles per hour is the plane's speed relative to the earth, relative basically means you're looking at the difference between these two things. The ABSOLUTE speed of the plane is actually 1700 miles per hour because it was already travelling at 1000 when it was sitting in the ground, and added 700 miles per hour when it took off. Absolute speed means the you are looking at basically everything that affects the speed of the plane (earth rotating, earth revolving around the sun etc. all add speed to the plane)
long story short the plane was already moving at the same speed as the earth and just added more speed when it took off. Its like if you ever jumped in an elevator at the last second when its going up, and jumped really high, that's because the elevator speed was added to your jump
IIN to wonder how a commercial airliner....
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Its called relative speed. 700 miles per hour is the plane's speed relative to the earth, relative basically means you're looking at the difference between these two things. The ABSOLUTE speed of the plane is actually 1700 miles per hour because it was already travelling at 1000 when it was sitting in the ground, and added 700 miles per hour when it took off. Absolute speed means the you are looking at basically everything that affects the speed of the plane (earth rotating, earth revolving around the sun etc. all add speed to the plane)
long story short the plane was already moving at the same speed as the earth and just added more speed when it took off. Its like if you ever jumped in an elevator at the last second when its going up, and jumped really high, that's because the elevator speed was added to your jump