Long gap between parts

Ive been playing PP for a few years and really after the challenges are done its all about getting new, special airplanes. Airplanes come in 3 parts and there is a challenge to get a part. Here is a list of times when there has been a new part. Can you guys step it up on the new parts?
Pocket Planes Prizes
15 June - No part
12 June - No part
8 June - No part
4 June - No part
1 June - No part
29 May - No part
25 May - No part
22 May - No part
18 May - Bobcat part
15 May - No part
12 May - No part
8 May - No part
5 May - No part
1 May - No part
27 April - No part
24 April - No part
21 April - balloon part
17 April - No part
13 April - C-130 part controls
10 April - No part
8 April - email sent
7 April - No part
4 April - No part
1 April - No part

Mccannam about Pocket Planes: Airline Tycoon, v1.2.1